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

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

Question 293914: If your class has 10 males and 15 females in it, how many different committees consisting of 4 males and 3 females can be chosen? Hints: Order IS NOT important here. Calculate the combinations of males and females and then total.
Click here to see answer by edjones(7569)

Question 293913: In a study of 4000 men who are 60 years old, 2600 were found to be grandfathers. Based on this data, what is the probability of a 60-year-old man being a grandfather?
Click here to see answer by edjones(7569)

Question 293893: A town's election for mayor drew 75% of the town's 800 eligible voters. What is the probability that two different randomly selected people both voted in the election?
Click here to see answer by stanbon(57246)

Question 293958: The Wilson has three job openings, dishwasher paying $5 per hour, chef paying $10 per hour and assistant manager at $15 an hour. Twelve people apply for all three. How many ways can the new employees be hired?
How do you do this? I need help! thanks!
Click here to see answer by stanbon(57246)

Question 293957: There are thirty-five (35) members in the Travel Club. Four (4) people will be chosen to win a vacation. How many ways can the four (4) be chosen if all four will win a trip to Las Vegas?
I have no idea how to do these types of problems! Help?!
Click here to see answer by stanbon(57246)

Question 293975: Sally takes a quiz with three true or false questions. She does not know the answer to any of the questions, so she guesses on all three. What is the probability she will get all three questions correct?
Click here to see answer by Fombitz(13828)

Question 293955: if 24 student total in a class 80 percent passed a exam how much failed out of the 24
Click here to see answer by checkley77(12569)

Question 293952: if 24 student total in a class 80 percent passed a exam how much failed
Click here to see answer by richwmiller(9135)

Question 294002: The "Daily Rago of Metropolis" states that the mean price of a house on Easy Street is $178,100. A realtor who sells houses on Easy Street thinks the mean price of a house is more than $178,100. If sample data is collected from 20 sales and the sample mean, xbar=$189,200 and the population standard deviation, r(greek sigma)=$18,725, test the realtor's claim at a(alpha)=0.05. Find the test statistic.
Click here to see answer by stanbon(57246)

Question 294041: Solve the equation.
(y - 9) - (y + 4)
Click here to see answer by Alan3354(30983)

Question 294040: Hi, I have about 25 problems I was wondering if someone wanted to do help me with. I have paypal. Please contact my email so we can set something up. Thanks
Click here to see answer by Alan3354(30983)

Question 294039: Solve the equation.
180 = 11x + 9x
Click here to see answer by Alan3354(30983)

Question 294052: A survey of 650 registered voters showed that 360 planned to vote for the candidate of the party that requested the survey. Test the claim that at a(alpha)=0.05 the party's candidate will receive more that 51% of the vote in the election, Use the P-value method.
Click here to see answer by stanbon(57246)

Question 294145: The digits 0, 1, 2, 3,and 4 are to be used in a three-digit ID card. How many different cards are possible if repetitions are NOT allowed?
I don't know how to do this!
Click here to see answer by jim_thompson5910(28504)

Question 294147: The Probability that Jodi makes a basket when playing basketball is .50, Jamal’s probability is .80 and Pat’s is .75. What is the probability that none of the three make a basket?
I need help!
Click here to see answer by richwmiller(9135)

Question 294138: a spinner is numbered 1-50. if you spin one time, what is the probability you will get: a) a multiple of 7? b) an even number between 20 and 30?
Click here to see answer by Earlsdon(6287)

Question 294211: please help me solve this trigonometric equation: sec(theta) = tan(theta) + cot(theta)
Click here to see answer by stanbon(57246)

Question 294211: please help me solve this trigonometric equation: sec(theta) = tan(theta) + cot(theta)
Click here to see answer by Alan3354(30983)

Question 294231: A multiple choice test has 20 questions with each having 4 possible answers with one correct. Assume a student randomly guesses the answer to every question
What is the probability of getting exactly 9 correct answers?
Click here to see answer by stanbon(57246)

Question 294304: Eight winners for a door prize will be selected at random, without replacement, from a list containing 10 men and 10 women.
1. How many different sets of eight winners can be selected for the door prize?
2. How many different sets of eight winners consisting of 4 men and 4 women can be selected for door prizes?
3. How many different sets of eight winners consisting of more women than men can be selected for door prizes?

Click here to see answer by stanbon(57246)

Question 294344: The probability that a pumpkin seed will germinate is 70%. A gardener plants in batches of 12.
1. what is the probability that exactly 10 seeds in a batch will germinate?
2. what is the probability that 10 or more seeds in a batch will germinate?
3. what is the probability that all seeds in a batch will germinate?
4. find the mean U *backwards u symbol*
5. find the the varience 0 and a little 2
*the question is find the variance for than its the selection symbol with a
small 2 above.
I do apologize if this is confusing.
Click here to see answer by stanbon(57246)

Question 294454: The ages of 25 employees in a company are listed below in a stem and leaf plot. What is the probability that a worker chosen at random will have an age greater than or equal to 30 and less than or equal to 39?

Click here to see answer by richwmiller(9135)

Question 294458: The time required to make 1100 gallons of synthetic rubber at a plant in South America in a recent year was normally distributed with a mean of 16 hours and a standard deviation of 3 hours. What is the probability that it will take more than 19 hours to make 1100 gallons of synthetic rubber?
Click here to see answer by Edwin McCravy(8882)

Question 294534: An airline company found that 80% of their flights arrive to their destination on time. We are interested in selecting a sample of 5 flights and calculating the probability of all of them getting to their destination on time. Choose the best answer of the following: (Points: 6)
This is an example of a Poisson probability experiment
This is an example of a Binomial probability experiment
This is neither a Poisson nor a Binomial probability experiment
Not enough information to determine the type of experiment

Click here to see answer by richwmiller(9135)

Question 294624: A Boss randomly selects reports from 8 of his 84 nurses on staff. How many different combinations of nurses can be selected?
Click here to see answer by stanbon(57246)

Question 294602: suppose 1000 coins are tossed. find the probability of getting the following result.
exactly 505 heads or more?
use the normal curve approximation to the binomial distribution (round to 4 decimal places
Click here to see answer by stanbon(57246)

Question 294537: Prof. Green’s multiple-choice exam had 50 questions with the distribution of correct answers shown below. Research question: At α = .05, can you reject the hypothesis that Green’s exam answers came from a uniform population
Correct Answer Frequency
A 8
B 8
C 9
D 11
E 14
Total 50
Can you help me solve this problem. I am supposed to create a null and alternative hypothesis. Show how the degress of freedom are calculated, find the critical value of chi squared and interpret the p-value as well as check for small expected frequencies
Click here to see answer by stanbon(57246)

Question 294647: 0.47 of all college students like the idea of a new curriculum.
If we select 92students (ASSUME INDEPENDENCE), what is the Standard Deviation of the Probability Distribution that would list the number of students (from 0 to 92) and the probability of each.
If the answer cannot be calculated, enter zero (0) as your answer.
4 decimal places otherwise.

Click here to see answer by stanbon(57246)

Question 294594: A bag contains 3 quarters and 5 dimes. Another bag contains 12 pennies and 8 nickels. One coin is chosen from each bag without looking. Find P [dime and penny].
Click here to see answer by Greenfinch(383)

Question 294644: The scores on a mathematics exam have a mean of 69 and a standard deviation of 6. Find the x-value that corresponds to the z-score 1.28.
Question 6 answers
a.70.3
b.75.0
c.61.3
d.76.7
Click here to see answer by stanbon(57246)

Question 294875: 1. You have just received a box of chocolates. There are three turtles, four caramels, and three chocolate covered cherries. If you choose two chocolates at random, what is the probability that the first one is caramel and the second is a turtle?
Click here to see answer by richwmiller(9135)

Question 294905: (Express the probability as a fraction in lowest terms, as a decimal,and as a percent.)
Find P(sum is 6 or sum is 9) Find P(sum in even)
Click here to see answer by Fombitz(13828)

Question 294974: Solve the problem.
According to police sources a car with a certain protection system will be recovered 90% of the time. Find the probability that 4 of 6 stolen cars will be recovered.
Question 4 answers
0.9
0.667
0.098
0.1
Click here to see answer by stanbon(57246)

Question 294986: In Dallas, some fire trucks were painted yellow, (instead of red) to heighten their visibility. During a test period, the fleet of red fire trucks made 135,035 runs and had 4 accidents. At σ=.01, did the yellow fire trucks have a significantly lower accident rate? A) State the hypotheses. B) State the decision rule and sketch it. C) Find the sample proportions and z test statistics. D) Make a decision. E) Find the p-value and interpret it. F) If statistically significant, do you think the difference is large enough to be important? If so, to whom, and why? G) Is the normality assumption fulfilled? Explain.
Click here to see answer by stanbon(57246)

Question 294715: A doctor is using a method of treatment that is thought to be 94% successful. What is the probability that their are no failures in 15 treatments (round to the nearest hundredth)?

Click here to see answer by stanbon(57246)

Question 294990: a jar contains 13 marbles, 3 red, 4 white, and 6 blue. Two marbles are drawn without replacement. What is the probability they are the same color?

Click here to see answer by stanbon(57246)

Question 294992: The theoretical probability that candidate Smith wins the election is given to be 13/18. What are equivalent odds that Smith wins?
Click here to see answer by Aust05(12)

Question 294837: Hi
I need help with this problem
Daniel's boat will go 15 miles per hour in still water. If he can go 12 miles downstream in the same amount of time as it takes to go 9 miles upstream, then what is the speed of the current?
thanks.
Click here to see answer by scott8148(6628)

Question 294982: During the period 1990-1998 there were 46 Atlantic hurricanes, of which 19 struck the United States. During the period 1999-2006 there were 70 hurricanes, of which 45 struck the United States. (A) Does this evidence convince you that the percentage of hurricanes that strike the United States is increasing, at Alpha=1? Show your work.(B) Can normality be assumed?
Click here to see answer by stanbon(57246)

Question 295016: The diameters of oranges in a certain orchard are normally distributed with a mean of 4.85 inches and a standard deviation of 0.40 inches.
1). What percentage of the oranges in this orchard have diameters less than 6.3 inches?

2). What percentage of the oranges in this orchard are larger than 4.75 inches?
Click here to see answer by stanbon(57246)

Question 295023: How does the standard normal distribution differ from the normal distribution?
Click here to see answer by stanbon(57246)

Question 295031: In testing a new drug, researchers found that 5% of all patients using it will have a mild side effect. A random sample of 12 patients using the drug is selected. Find the probability that:

(A) exactly three will have this mild side effect
(B) at least two will have this mild side effect.

Click here to see answer by stanbon(57246)

Question 295076: This web site doesn't tell me how to do these problems with only variables. My question is nPn. First Iwrote it out to n! over (n-n)!. then I got n! over 1. Then what do I do. Is is One? or is it n? i dont know what i did wrong.
Click here to see answer by Edwin McCravy(8882)

Question 295124: A math test has 10 T/F questions. What is the probability that you get at least 8 correct by randomly guessing?
This is what i got but im not sure if it is right.
1x.5^8= .003906
i multiply 1 by .5 and make it to 8th power because each question have 50, 50 change and there are 8 that have to be T.
Click here to see answer by edjones(7569)

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, 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