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

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

Question 415837: 6 1/4 - 3 10/12=?
Click here to see answer by Alan3354(30993)

Question 415837: 6 1/4 - 3 10/12=?
Click here to see answer by sudhanshu_kmr(1152)

Question 415884: Fawns between 1 and 5 months old in Mesa Verde National Park have a body weight that is approximately normally distributed with mean μ = 27.2 kilograms and standard deviation σ = 4.3 kilograms Let X be the weight of a fawn in kilograms. Convert each of the following X intervals to Z intervals:
I am getting confused when it comes to X <, or 19 X, and etc. How do we look at these?
(a) X < 30
(b) 19 < X
(c) 32 < x < 35
(d) -2.17 < Z
(e) Z < 1.28

Click here to see answer by stanbon(57290)

Question 415896: Does anyone know what the formula for the weighted sample proportion variance is?
Click here to see answer by stanbon(57290)

Question 415828: Can you help me solve this please:
Let x be a binomial random variable with n=12 and p=0.3 find p(4
Click here to see answer by stanbon(57290)

Question 415815: A. If the correlation coefficient is 0.04, what is the sign of the slope of the regression line?
B. As the correlation coefficient increases from 0.22 to 0.20, do the points of the scatter plot move toward the regression line, or away from it?

Click here to see answer by stanbon(57290)

Question 415804: Pleas help me solve this:
There are 4 blood types: A, B, AB and O. Blood can also be Rh+ and Rh-. Finally a blood donor can be classified as either male or female. How many ways can a donor have his or her blood labeled?
Click here to see answer by stanbon(57290)

Question 415661: if jane has 100 marbles. 25 white marbles and 35 red ones and the rest blue. is she randomly picks picks a marble from the bag, what is the probability that the marbles wont be red or white? Plzzzzzzzzzzzzz help me ive been up all night tryin to figure this problem out
Click here to see answer by stanbon(57290)

Question 415979: What is greater or lesser if x over y = 0.3and both x and y are positive numbers
Click here to see answer by stanbon(57290)

Question 416263: At a track meet 6 runners out of 20 must be chosen and their position are assigned for the frist heat of the race. In how many ways can this be done? I got 38760, but the teachers says it is wrong. I don't understand how to solve it.
Click here to see answer by scott8148(6628)

Question 416278: Samples of laboratory glass are in small, light packaging or heavy,large packaging. Suppose that 2 and 1% of the sample shipped insmall and large packages, respectively, break during transit. If60% of the samples are shipped in large packages and 40% areshipped in small packages, what proportion of samples break duringshipment?
Click here to see answer by josmiceli(9668)

Question 416405: Each question of a five-question multiple choice exam has four possible answers. Whitney picks an answer at random for each question. Find the probability that she selects the correct answer on only the second and third question.
Click here to see answer by stanbon(57290)

Question 416416: A bag contains 15 chips-five are blue, four are red, and six are white. If four are picked one at a time without replacement, what is the probability that at least one red chip is picked?
Click here to see answer by stanbon(57290)

Question 416417: A bag contains 15 chips-five are blue, four are red, and six are white. If four are picked one at a time without replacement, what is the probability that at least one red chip is picked.
Click here to see answer by stanbon(57290)

Question 416418: Each question of a five-question multiple choice exam has four possible answers. Whitney picked an answer at random for each question. Find the probability that she selects the correct answer on only the second and third questions.
Click here to see answer by stanbon(57290)

Question 416434: Hello,
I'm having a little trouble with this problem and I was wondering if someone could help me??
Here is the problem and answer choices below:
13) I n one town, 35% of households have a cat, 23% of households have a
dog, and 7% have both. What is the probability that a household has a
dog if you know that it has a cat?
a)7/35
b)23/35
c)7/23
d) 23/100
thanks!!
Click here to see answer by stanbon(57290)

Question 416427: Hello,
I am having trouble with this homework question and after trying to solve it, I'm worried that my answer is not correct. Can you please help me??
Here is the problem and the answer choices:
12) Two cards are drawn without replacement from an ordinary deck of 52
playing cards. What is the probability that the second card is a spade if
the first card was not a spade?
a)1/4
b)4/17
c)13/51
d)4/51
Here is my answer : c
Is that correct??
Thank you for your time and consideration
Click here to see answer by Edwin McCravy(8895)

Question 416445: Hello,
I was wondering if someone could check this problem for me because I'm not 100% sure my answer is correct.
Here is the problem asnd answer choices below:
14) A die is rolled twice. What is the probability of getting a sum greater
than or equal to ten?
a) 1/6
b) 1/4
c) 5/36
d) 1/12
Here's my answer: B
Is it correct??
Thank you for your hard work, time, and consideration.
Click here to see answer by MathLover1(6625)

Question 416446: Hello,
I was wondering if someone could check this problem for me.
Here is the problem and answer choices below:
5) C onsider a bowl containing 36 different slips of paper. Ten of the slips
of paper each contain one of the digits from the set 0 through 9 and 26
slips each contain one of the 26 letters of the alphabet. If one slip is
drawn at random, what is P(a number that is not prime appears on the
slip)?
a)6/10
b)5/36
c)4/36
d)6/36
For my answer I am torn between answers A and D??
Thanks for everything!!
Click here to see answer by stanbon(57290)

Question 416597: Consider the experiment of selecting a card from
an ordinary deck of 52 playing cards and determine the probability
of the stated event: A card that is not a king and not a spade is drawn?
Click here to see answer by stanbon(57290)

Question 416510: Fidelity Magellan is a large cap growth mutual fund and Fidelity Small Cap Stock is a small cap growth mutual fund. The standard devitation for both funds was computed based on a sample of size 26. For Fidelity Magellan, the sample standard deviation is 8.89%; for Fidelity Small Cap Stock, the sample standard deviation is 13.03. Financial analysts often use the standard deviation as a measure of risk. Conduct a hypothesis test to determine whether the small cap growth fund is risckier than the large cap growth fund. Use a = .05 as the level of significance.
Click here to see answer by stanbon(57290)

Question 416611: Your instructor tells you that the probability of making in A in this Statistics course is 15%. If 10 students are in the course, what is the probability that at least ONE of them will make an A?
Click here to see answer by stanbon(57290)

Question 416646: In a family with two children, what are the probabilities
of the following outcomes, assuming that the birth of
boys and girls is equally likely?
a. Both are boys.
b. The first is a girl and the second a boy.
c. Neither is a girl.
d. At least one is a girl.
Please help me with this using fractions. Thanks!!!
Click here to see answer by stanbon(57290)

Question 416727: What is the probability of not getting a 7 on two dice?
Click here to see answer by solver91311(16877)

Question 416882: What is the probability that three tails do not come up on a throw of three dimes?
Click here to see answer by sudhanshu_kmr(1152)

Question 416881: What is the probability of not getting a 9 on two dice?
Click here to see answer by sudhanshu_kmr(1152)

Question 416881: What is the probability of not getting a 9 on two dice?
Click here to see answer by ewatrrr(10682)

Question 416725: What is the probability of getting a 9 on two dice?
Click here to see answer by ewatrrr(10682)

Question 416883: You want to play a lottery that uses balls numbered 1 to 50. You have to get five numbers correct, but the order doesn't matter. What is your probability of winning?
Click here to see answer by sudhanshu_kmr(1152)

Question 416724: What is the probability of getting a 2 or a 12 on two dice?
Click here to see answer by ewatrrr(10682)

Question 416884: What is your probability of not getting a spade from a deck of 52 cards?
Click here to see answer by sudhanshu_kmr(1152)

Question 416884: What is your probability of not getting a spade from a deck of 52 cards?
Click here to see answer by ewatrrr(10682)

Question 416884: What is your probability of not getting a spade from a deck of 52 cards?
Click here to see answer by MathLover1(6625)

Question 416795: Assume the probability that an employee selling products is successful in a randomly selected sales call is 0.5.
Assume sales calls are independent and the employee is doing 2 sales calls.
What is the probability that at least one of the two sales calls is successful?
Click here to see answer by ewatrrr(10682)

Question 416737: In the tests of a new pharmaceutical product, data were
collected for use in the approval process required by the
U.S. Food and Drug Administration (FDA). Some participants
were given a placebo, an inert substance that
looks like the drug; others were given the drug. The
data are shown in the following table:
Drug: No Help 22 Help 47
Placebo: No Help 31 Help 20
What is the probability that:
a) the participants perceived that their “medication”
helped if they received the drug?
b) the participants perceived that their “medication”
helped if they received the placebo?
c) the participants perceived that their “medication”
helped?
I'm having a huge issue with this. Could you please show your work, or just explain how it's done so I can learn the method as well as understand what the answers are? Thanks so much!!!!
Click here to see answer by ewatrrr(10682)

Question 416722: What is the probability that three tails come up on a throw of three dimes?
Click here to see answer by ewatrrr(10682)

Question 416671: a card is chosen at random from a pack of 52 playing cards.find the probability that the card is king or a red card
Click here to see answer by ewatrrr(10682)

Question 416921: how to solve (n-2)!/(n-1)!
Click here to see answer by Edwin McCravy(8895)

Question 416954: In ghana,vehicle licence numbers follow the system of 2 letters followed by 4 digits and then by a letter.how many licence plates are possible
Click here to see answer by sudhanshu_kmr(1152)

Question 416956: How many six-digit telephone numbers are possible if the first digit cannot be a (0)
Click here to see answer by sudhanshu_kmr(1152)

Question 416931: how do you work out probibility????
Click here to see answer by ewatrrr(10682)

Question 416622: Hi I got a problem of solving this problem: Please help me I badly need it.
7. A random sample of 12 preschool pupils were rated by their teacher on their reading readiness based on a scale of 25 points at the start of the school year. The same pupils were rated by the same teacher at the end of the school year. The ratings are shown in the table below
Pupil 1 2 3 4 5 6 7 8 9 10 11 12
Start 25 22 20 21 20 15 17 22 19 16 19 18
End 25 23 23 22 22 20 19 20 18 18 21 23

Is there significant difference in the reading readiness of the pupils at the start and at the end of the
school year? Test at 0.05 level of significance.

Click here to see answer by ewatrrr(10682)

Question 416946: A pet supplier has a stock of parakeets of which 30% are blue parakeets. A pet store orders 3 parakeets from this supplier. If the supplier selects the parakeets at random, what is the chance that the pet store gets exactly one blue parakeet?
Click here to see answer by ewatrrr(10682)

Question 417148: In how many ways can a committee of four men and three women be formed from a group of 15 men and ten women?
Click here to see answer by chineseballer06(1)

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