Questions on Algebra: Probability and statistics answered by real tutors!

Tutors Answer Your Questions about Probability-and-statistics (FREE)

Question 629658: In order to develop a more appealing cheeseburger, a franchise uses taste tests with 9 different buns, 6 different cheeses, 2 types of lettuce, and 5 types of tomatoes. If the taste tests were done at one restaurant by one tester who takes 10 minutes to eat a cheeseburger, how many hours would it take the tester to eat all possible cheeseburgers?
Click here to see answer by jim_thompson5910(28704)

Question 629672: Here is my problem, I do not fully understand but the work I have done so far has me thinking that the probability that a randomly sampled score based on the example would be equal to or greater than a score of 134 is 4.01%
In a research study, you measured the weights of all learners in a college freshman class. The normally distributed set of scores for the population of learners has a mean of 120 pounds and a standard deviation of 8 pounds.
If you randomly sampled one score from the population, what is the probability it would be equal to or greater than a score of 134?
How would you briefly explain the results.

Click here to see answer by ewatrrr(10682)

Question 629651: I have six grandchildren all born in different years. Three of them were born on July 17th. None of the deliveries were planned for that day, that's just when it happened. What are odds of that?
Thank you,
Jodie Neumeier
jodieneumeier@aol.com
Click here to see answer by richwmiller(9144)

Question 629719: an automobile saleswoman finds that the probability of making a sale is 0.23. If she talks to four customers today, find the probablility that she will sell four cars?

Click here to see answer by ewatrrr(10682)

Question 629744: There are three components that operate in a series so all must function properly if it is to be complete. The probability of failure during one period of operation are .03, .05, .06. Component failures are statistically independent.
a) Fine the probability that the system functions properly.
b) Find the probability that the system fails during one period of operation
This is what I have done so far but I'm not sure its the right answer please help me and show how you got to the answer so I understand
a) .97*.95*.94=.866
b)(.03+.05+.06)-(.03*.05*.06)=.14
Click here to see answer by Theo(3504)

Question 629789: a box contains 8 white balls, 4 black balls, and 9 red balls.
how many red balls must be added to the box so that the probability of drawing a red ball is 2/3 ?
how many black balls must be added to the original box so that the probability of drawing a white ball is 1/3 ?
Click here to see answer by stanbon(57956)

Question 629805: Becky and Sam are both taking History and attend independently. Becky attends 83.9% of the time and Sam attends 95.1% of the time.
-What is the probability that at least 1 will NOT be in class?
I believe that this is 1-(Probability of both in class). P=1-(.951*.839) or .20211
-What is the probability that NEITHER are in class on any given day?
I believe that this would be the complements multiplied: P= (.161*.049) or .007889
I think that I have worked these out correctly, but am not entirely sure.

Click here to see answer by solver91311(17075)

Question 629786: ely santos is working part time at a restaurant in makati. if she works for 30 hours in one week on the average, how many hours a day does she work? ( conasider 6 days a week work)
Click here to see answer by solver91311(17075)

Question 475906: 16.26 Below are grade point averages for 25 randomly chosen university business students during a recent semester. Research question: At α = .01, are the median grade point averages the same for
students in these four class levels?
Grade Point Averages of 25 Business Students
Freshman Sophomore Junior Senior
(5 students) (7 students) (7 students) (6 students)
1.91 3.89 3.01 3.32
2.14 2.02 2.89 2.45
3.47 2.96 3.45 3.81
2.19 3.32 3.67 3.02
2.71 2.29 3.33 3.01
2.82 2.98 3.17
3.11 3.26

Click here to see answer by f8k_name(1)

Question 629764: If a baseball manager has five pitchers and two catchers, how many different possible pitcher-catcher lists can he field?

Click here to see answer by richwmiller(9144)

Question 629925: A psychology quiz consists of ten true-or-false questions. If a student knows the correct answer to six of the questions, but determines the answers to the remaining questions by flipping a coin. What is the probability that she will obtain a score of at least 90%?
Click here to see answer by ewatrrr(10682)

Question 629926: A box contains 15 large marbles and 18 small marbles. each marble is either green or white. 8 of the large marbles are green and 8 of the small marbles are white. If a marble is randomly selected from the box, what is the probability that it is large or white? Enter your answer as a fraction or a decimal number rounded to 3 decimal places. If you could explain it step by step it would be GREATLY appreciated!
Click here to see answer by ewatrrr(10682)

Question 629872: a single die is rolled one time. Determine the probability of rolling;
A number greater than 3 or less than 5

Click here to see answer by jsmallt9(3296)

Question 629942: an executive committee consists of 11 members: 4 men and 7 women. 3 members are selected at random to attend a meeting in Hawaii. The names are drawn from a hat. What is the probability that all 3 selected are women?
Click here to see answer by ewatrrr(10682)

Question 630026: Classify the following variable as nominal, ordinal, discrete, or continuous and state why it is such a variable:
your name
Click here to see answer by Theo(3504)

Question 630033: Izza has a number cube with sides labeled 1 through 6. What is the likelihood that she rolls three 5's in a row?
Click here to see answer by stanbon(57956)

Question 630029: Classify the following variable as nominal, ordinal, discrete, or continuous and state why it is such a variable:
your name
Click here to see answer by stanbon(57956)

Question 630028: Help.
Classify the following as an example of a nominal, ordinal, interval, or ratio level of measurement, and state why it represents this level:
marital status of a company’s employees
Click here to see answer by stanbon(57956)

Question 630027: Classify the following as an example of a nominal, ordinal, interval, or ratio level of measurement, and state why it represents this level:
marital status of a company’s employees
Click here to see answer by stanbon(57956)

Question 630025: Construct a grouped frequency distribution for the following 28 scores using a class width of 4:
79 64 77 69 82 73 85 74 76 81 86 74 87 84
77 73 71 75 86 76 72 76 70 72 76 67 70 67
Click here to see answer by stanbon(57956)

Question 630030: I am lost.
Construct a grouped frequency distribution for the following 28 scores using a class width of 4:
79 64 77 69 82 73 85 74 76 81 86 74 87 84
77 73 71 75 86 76 72 76 70 72 76 67 70 67
Click here to see answer by Theo(3504)

Question 630051: A fair coin tossed 64 times. Find the probability of getting 32 to 40 heads inclusive
Click here to see answer by ewatrrr(10682)

Question 630051: A fair coin tossed 64 times. Find the probability of getting 32 to 40 heads inclusive
Click here to see answer by Theo(3504)

Question 630051: A fair coin tossed 64 times. Find the probability of getting 32 to 40 heads inclusive
Click here to see answer by AnlytcPhil(1278)

Question 630067: Let be a standard normal random variable. Calculate the following probabilities using the calculator provided. Round your responses to at least three decimal places.
P(z > 1.73) = ?
P(1.09 < Z < 2.17)= ?
Click here to see answer by solver91311(17075)

Question 630065: Consider a t distribution with 22 degrees of freedom. Compute P(t>= 1.44). Round your answer to at least three decimal places.
Consider a t distribution with 25 degrees of freedom. Find the value of C such that P(-c Please help! I am soooo lost!
Click here to see answer by stanbon(57956)

Question 630068: A worldwide organization of academics claims that the mean IQ score of its members is 112, with a standard deviation of 15. A randomly selected group of 35 members of this organization is tested, and the results reveal that the mean IQ score in this sample is 117.2. If the organization's claim is correct, what is the probability of having a sample mean of 117.2 or less for a random sample of this size?
Carry your intermediate computations to at least four decimal places. Round your answer to at least three decimal places.
Click here to see answer by stanbon(57956)

Question 630063: A consumer advocacy group is doing a large study on car rental practices. Among other things, the consumer group would like to estimate the mean monthly mileage,u , of cars rented in the U.S. over the past year. The consumer group plans to choose a random sample of monthly U.S. rental car mileages and then estimate u using the mean of the sample.
Using the value 850 miles per month as the standard deviation of monthly U.S. rental car mileages from the past year, what is the minimum sample size needed in order for the consumer group to be 90% confident that its estimate is within 175 miles per month of u?
Carry your intermediate computations to at least three decimal places. Write your answer as a whole number (and make sure that it is the minimum whole number that satisfies the requirements).
Click here to see answer by stanbon(57956)

Question 630006: The average monthly mortage payment including principal and interest is $982 in the United states. If the standard deviation is approximately $180 and the mortage payments are approximately normally distributed, find the probability that a randomly selected monthly payment is
a. more than $1000
b. More that $1475
c. between $800 and $1150
Click here to see answer by stanbon(57956)

Question 630084: Please help me with this problem.
I have 7 chocolate and 5 vanilla candies in a bag and 3 pieces are taken out. What is the probability that 1 is chocolate and 2 are vanilla. Thank you for your help in advance.
Click here to see answer by AnlytcPhil(1278)

Question 630178: Can someone please assit me with this? I am not getting this at all.
An April 2004 article on Hear The Issues.com stated that Americans have an average of 2.24 televisions per household (source: Nielsen Media Research). If the standard deviation for the number of televisions in a U.S. household is 1.2 and a random sample of 80 American households is selected, the mean of this sample belongs to a sampling distribution.
- What is the mean and standard deviation of this sampling distribution?

Click here to see answer by Theo(3504)

Question 630248: Can someone kindly tell me if my answer is correct?
Thank you.
A research center estimates that at least 35% of U.S. adults eat breakfast every day. In a random sample of 300 U.S. adults, 38% say they eat breakfast every day. At α = 0.05, conclude a hypothesis test for the population proportion, p.
My answer for Z = 1.09

Fail to reject the claim because there is not enough evidence to reject the claim.
Click here to see answer by stanbon(57956)

Question 630222: A committee of 4 women and 3 men need to select a chair person and a secretary. If every person is equally likely to be chosen, what is the probability that :
a) both positions are filled by women?
b) both positions are filled by men?
c) the chairperson is female and the secretary is male?

Click here to see answer by stanbon(57956)

Question 630275: How many different teams of 2 people each can Joshua select from a group of 5 people?
please include explanations!
Click here to see answer by rapaljer(4667)

Question 630243: Lilly collects data on a sample of 40 high school students to evaluate whether the proportion of female high school students who take advanced math courses in high school varies depending upon whether they have been raised primarily by their father or by both their mother and their father. Two variables are found below in the data file: math (0 = no advanced math and 1 = some advanced math) and Parent (1= primarily father and 2 = father and mother).
Parent Math
1.0 0.0
1.0 0.0
1.0 0.0
1.0 0.0
1.0 0.0
1.0 0.0
1.0 0.0
1.0 0.0
1.0 0.0
1.0 0.0
1.0 0.0
1.0 0.0
1.0 0.0
1.0 0.0
1.0 0.0
1.0 0.0
1.0 0.0
1.0 0.0
1.0 0.0
1.0 0.0
2.0 0.0
2.0 1.0
2.0 1.0
2.0 1.0
2.0 1.0
2.0 1.0
2.0 1.0
2.0 1.0
2.0 1.0
2.0 1.0
2.0 0.0
2.0 0.0
2.0 0.0
2.0 0.0
2.0 0.0
2.0 0.0
2.0 0.0
2.0 0.0
2.0 0.0
2.0 0.0
a) Conduct a crosstabs analysis to examine the proportion of female high school students who take advanced math courses is different for different levels of the parent variable.
b) What percent female students took advanced math class
c) What percent of female students did not take advanced math class when females were raised by just their father?
d) What are the Chi-square results? What are the expected and the observed results that were found? Are they results of the Chi-Square significant? What do the results mean?
e) What were your null and alternative hypotheses? Did the results lead you to reject or fail to reject the null and why?

Click here to see answer by lynnlo(4169)

Question 630293: A flower vase contains 3 white flowers,4 blue flowers, 2 yellow flowers,and 6 red flowers.If one is randomly picked,what is the probabily that it will be white?
Click here to see answer by ewatrrr(10682)

Question 630317: I don't know what a theoretical probability is. The question is: Megan rolls a number cube whose faces are labeled 7 through 12. Find the probability of P(even) and write it as a fraction. Please help me.
Click here to see answer by ewatrrr(10682)

Question 629222: In a certain town, 38.6% of voters are Democrats, 57.1% of the voters are
Republican, and 4.3% of the voters are Independents. In the last election,
43.1% of the Democrats, 40.7% of the Republicans, and 51.7% of the Independents
voted. If a citizen who voted in the last election is randomly selected, what is
the probability that they are a democrat?
Any help would be great! i'm so lost thank you!
Click here to see answer by Tizpan(1)

Question 630474: The San Diego Union Tribune reported student loan default rates for private, for-profit colleges in San Diego County (July 10, 2012). One university in particular, Bridgepoint, had a 15.3 percent loan-default rate.
Suppose 10 Bridgepoint students with student loans are sampled. What is the standard deviation of the distribution of the number of students who will default on these loans?
Answer
.1530
.1877
1.1384
1.2369
1.2959
1.530
1.6794

Click here to see answer by ewatrrr(10682)

Question 630574: A bag contains 8 white and 2 red marbles. A marble is removed at random, its color is noted and it is replaced back into the bag.
The experiment is repeated 5 times in all.
Describe the distribution followed by the number of red marbles removed.
Click here to see answer by stanbon(57956)

Question 630558: Help,
In your own line of work, give one example of a discrete
and one example of a continuous random variable, and describe why each is continuous or discrete.
Click here to see answer by stanbon(57956)

Question 630473: I am looking for help regarding this problem please.
A mail order company has an 8% success rate. If it mails advertisements to 600 people, find the probability of getting less than 40 sales.
Click here to see answer by stanbon(57956)

Question 630463: I am having a difficult time with this problem.
With 71.1% of a town's population made up of college students, what is the probability that in a random sample of 150 people from the town, more than 50 are not college students?
Click here to see answer by stanbon(57956)

Question 630356: If X is a normal random variable with standard deviation 3.50, and if the probability that X is more than 12.33 is .1271, then what is the mean of X?
Click here to see answer by stanbon(57956)

Question 630594: A researcher wanted to see which candidate you would vote for. What level of significance would she use in testing?
Click here to see answer by richard1234(5390)

Older solutions: 1..45, 46..90, 91..135, 136..180, 181..225, 226..270, 271..315, 316..360, 361..405, 406..450, 451..495, 496..540, 541..585, 586..630, 631..675, 676..720, 721..765, 766..810, 811..855, 856..900, 901..945, 946..990, 991..1035, 1036..1080, 1081..1125, 1126..1170, 1171..1215, 1216..1260, 1261..1305, 1306..1350, 1351..1395, 1396..1440, 1441..1485, 1486..1530, 1531..1575, 1576..1620, 1621..1665, 1666..1710, 1711..1755, 1756..1800, 1801..1845, 1846..1890, 1891..1935, 1936..1980, 1981..2025, 2026..2070, 2071..2115, 2116..2160, 2161..2205, 2206..2250, 2251..2295, 2296..2340, 2341..2385, 2386..2430, 2431..2475, 2476..2520, 2521..2565, 2566..2610, 2611..2655, 2656..2700, 2701..2745, 2746..2790, 2791..2835, 2836..2880, 2881..2925, 2926..2970, 2971..3015, 3016..3060, 3061..3105, 3106..3150, 3151..3195, 3196..3240, 3241..3285, 3286..3330, 3331..3375, 3376..3420, 3421..3465, 3466..3510, 3511..3555, 3556..3600, 3601..3645, 3646..3690, 3691..3735, 3736..3780, 3781..3825, 3826..3870, 3871..3915, 3916..3960, 3961..4005, 4006..4050, 4051..4095, 4096..4140, 4141..4185, 4186..4230, 4231..4275, 4276..4320, 4321..4365, 4366..4410, 4411..4455, 4456..4500, 4501..4545, 4546..4590, 4591..4635, 4636..4680, 4681..4725, 4726..4770, 4771..4815, 4816..4860, 4861..4905, 4906..4950, 4951..4995, 4996..5040, 5041..5085, 5086..5130, 5131..5175, 5176..5220, 5221..5265, 5266..5310, 5311..5355, 5356..5400, 5401..5445, 5446..5490, 5491..5535, 5536..5580, 5581..5625, 5626..5670, 5671..5715, 5716..5760, 5761..5805, 5806..5850, 5851..5895, 5896..5940, 5941..5985, 5986..6030, 6031..6075, 6076..6120, 6121..6165, 6166..6210, 6211..6255, 6256..6300, 6301..6345, 6346..6390, 6391..6435, 6436..6480, 6481..6525, 6526..6570, 6571..6615, 6616..6660, 6661..6705, 6706..6750, 6751..6795, 6796..6840, 6841..6885, 6886..6930, 6931..6975, 6976..7020, 7021..7065, 7066..7110, 7111..7155, 7156..7200, 7201..7245, 7246..7290, 7291..7335, 7336..7380, 7381..7425, 7426..7470, 7471..7515, 7516..7560, 7561..7605, 7606..7650, 7651..7695, 7696..7740, 7741..7785, 7786..7830, 7831..7875, 7876..7920, 7921..7965, 7966..8010, 8011..8055, 8056..8100, 8101..8145, 8146..8190, 8191..8235, 8236..8280, 8281..8325, 8326..8370, 8371..8415, 8416..8460, 8461..8505, 8506..8550, 8551..8595, 8596..8640, 8641..8685, 8686..8730, 8731..8775, 8776..8820, 8821..8865, 8866..8910, 8911..8955, 8956..9000, 9001..9045, 9046..9090, 9091..9135, 9136..9180, 9181..9225, 9226..9270, 9271..9315, 9316..9360, 9361..9405, 9406..9450, 9451..9495, 9496..9540, 9541..9585, 9586..9630, 9631..9675, 9676..9720, 9721..9765, 9766..9810, 9811..9855, 9856..9900, 9901..9945, 9946..9990, 9991..10035, 10036..10080, 10081..10125, 10126..10170, 10171..10215, 10216..10260, 10261..10305, 10306..10350, 10351..10395, 10396..10440, 10441..10485, 10486..10530, 10531..10575, 10576..10620, 10621..10665, 10666..10710, 10711..10755, 10756..10800, 10801..10845, 10846..10890, 10891..10935, 10936..10980, 10981..11025, 11026..11070, 11071..11115, 11116..11160, 11161..11205, 11206..11250, 11251..11295, 11296..11340, 11341..11385, 11386..11430, 11431..11475, 11476..11520, 11521..11565, 11566..11610, 11611..11655, 11656..11700, 11701..11745, 11746..11790, 11791..11835, 11836..11880, 11881..11925, 11926..11970, 11971..12015, 12016..12060, 12061..12105, 12106..12150, 12151..12195, 12196..12240, 12241..12285, 12286..12330, 12331..12375, 12376..12420, 12421..12465, 12466..12510, 12511..12555, 12556..12600, 12601..12645, 12646..12690, 12691..12735, 12736..12780, 12781..12825, 12826..12870, 12871..12915, 12916..12960, 12961..13005, 13006..13050, 13051..13095, 13096..13140, 13141..13185, 13186..13230, 13231..13275, 13276..13320, 13321..13365, 13366..13410, 13411..13455, 13456..13500, 13501..13545, 13546..13590, 13591..13635, 13636..13680, 13681..13725, 13726..13770, 13771..13815, 13816..13860, 13861..13905, 13906..13950, 13951..13995, 13996..14040, 14041..14085, 14086..14130, 14131..14175, 14176..14220, 14221..14265, 14266..14310, 14311..14355, 14356..14400, 14401..14445, 14446..14490, 14491..14535, 14536..14580, 14581..14625, 14626..14670, 14671..14715, 14716..14760, 14761..14805, 14806..14850, 14851..14895, 14896..14940, 14941..14985, 14986..15030, 15031..15075, 15076..15120, 15121..15165, 15166..15210, 15211..15255, 15256..15300, 15301..15345, 15346..15390, 15391..15435, 15436..15480, 15481..15525, 15526..15570, 15571..15615, 15616..15660, 15661..15705, 15706..15750, 15751..15795, 15796..15840, 15841..15885, 15886..15930, 15931..15975, 15976..16020, 16021..16065, 16066..16110, 16111..16155, 16156..16200, 16201..16245, 16246..16290, 16291..16335, 16336..16380, 16381..16425, 16426..16470, 16471..16515, 16516..16560, 16561..16605, 16606..16650, 16651..16695, 16696..16740, 16741..16785, 16786..16830, 16831..16875, 16876..16920, 16921..16965, 16966..17010, 17011..17055, 17056..17100, 17101..17145, 17146..17190, 17191..17235, 17236..17280, 17281..17325, 17326..17370, 17371..17415, 17416..17460, 17461..17505, 17506..17550, 17551..17595, 17596..17640, 17641..17685, 17686..17730, 17731..17775, 17776..17820, 17821..17865, 17866..17910, 17911..17955, 17956..18000, 18001..18045, 18046..18090, 18091..18135, 18136..18180, 18181..18225, 18226..18270, 18271..18315, 18316..18360, 18361..18405, 18406..18450, 18451..18495, 18496..18540, 18541..18585, 18586..18630, 18631..18675, 18676..18720, 18721..18765, 18766..18810, 18811..18855, 18856..18900, 18901..18945, 18946..18990, 18991..19035, 19036..19080, 19081..19125, 19126..19170, 19171..19215, 19216..19260, 19261..19305, 19306..19350, 19351..19395, 19396..19440, 19441..19485, 19486..19530, 19531..19575, 19576..19620, 19621..19665, 19666..19710, 19711..19755, 19756..19800, 19801..19845, 19846..19890, 19891..19935, 19936..19980, 19981..20025, 20026..20070, 20071..20115, 20116..20160, 20161..20205, 20206..20250, 20251..20295, 20296..20340, 20341..20385, 20386..20430, 20431..20475, 20476..20520, 20521..20565, 20566..20610, 20611..20655, 20656..20700, 20701..20745, 20746..20790, 20791..20835, 20836..20880, 20881..20925, 20926..20970, 20971..21015, 21016..21060, 21061..21105, 21106..21150, 21151..21195, 21196..21240, 21241..21285, 21286..21330, 21331..21375, 21376..21420, 21421..21465, 21466..21510, 21511..21555