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

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 Algebra: Probability and statistics Solvers Lessons Answers archive Quiz In Depth

 Question 675006: If you roll a die 50 times and 10 of the rolls result in a "5," what empirical probability was observed for the event "5"? Click here to see answer by stanbon(60778)

 Question 674986: In how many different ways can the top nine new indie bands be ranked on a top nine list? The top hit song for each of the nine bands will compete to receive monetary awards of \$1000, \$500, \$250 and \$100, respectively. In how many ways can the awards be given out? Click here to see answer by stanbon(60778)

 Question 674985: A student takes a 10 question true-false quiz, but did not study and randomly guesses each answer. Find the probability that the student passes the quiz with a grade of at least 40% of the questions correct. (Round your answer to three decimal places.) Click here to see answer by stanbon(60778)

 Question 674964: A multiple choice quiz has 5 questions, each with 5 answers. If you guess on all 5 questions what is the probability that you get at least one right? Click here to see answer by stanbon(60778)

 Question 674913: Could someone please help me with this stats problem I do not understand it at all.. Thanks in advance. A researcher is interested in estimating the noise levels in decibels at area urban hospitals. She wants to be 99% confident that her estimate is correct.If the standard deviation is 4.09, how large a sample is needed to get the desired information to be accurate within 0.53 decibels? Show all work Click here to see answer by stanbon(60778)

 Question 674700: The probability that a person can roll his or her tongue is 70%. Click here to see answer by stanbon(60778)

 Question 675152: case study for bayview case study hypothesis test Click here to see answer by lynnlo(4174)

 Question 675164: If you are dealt two cards successively (with replacement of the first) from a standard deck of 52 playing cards, find the probability, as a fraction, of getting a heart as the first card and a diamond as the second. Click here to see answer by ewatrrr(11176)

 Question 675165: A sample of 4 different calculators is randomly selected from a group containing 16 that are defective and 30 that have no defects. What is the probability, as a decimal, that at least one of the 4 calculators in the sample is defective? Click here to see answer by ewatrrr(11176)

 Question 675253: A bag contains x pink balls and y yellow balls. Three balls randomly selected from the bag. Write down an expression for the probability that the three balls chosen were pink. If there had been one more pink ball, then the probability that the three balls chosen were pink would have been double the answer. Click here to see answer by lynnlo(4174)

 Question 675276: suppose a computer virus begins by infecting 8 computers in the first hour after it is released. each hour after that, each newly infected computer causes 8 more computers to become infected. the function y=8^x models this situation.make a table with integer values of x from 1 to 4 Click here to see answer by ewatrrr(11176)

 Question 675380: On October 18, Marge Smith paid a state income tax payment, which was due on June 30. The penalty was 9% simple interest on her unpaid tax of \$698. Find the penalty using exact interest. Click here to see answer by lynnlo(4174)

 Question 675446: A confidence interval estimate for the population mean is given to be (39.86, 47.87). If the standard deviation is 16.219 and the sample size is 63, answer each of the following (show all work): (A) Determine the maximum error of the estimate, E. (B) Determine the confidence level used for the given confidence interval. Click here to see answer by jim_thompson5910(29613)

 Question 675490: I have a normal distribution that has a mean of 100 and SD of 8 I need to find out the area or probability of p(x>108) Click here to see answer by stanbon(60778)

 Question 675479: Scores on a certain exam are normally distributed with a mean of 78 and a variance of 25. What is the z-value for a score of 90? Click here to see answer by stanbon(60778)

 Question 675464: A 3-card hand is drawn from a standard deck of 52 playing cards. Find the probability that the hand contains exactly 3 spades? Click here to see answer by stanbon(60778)

 Question 675430: Assume that the mean score on a certain aptitude test across the nation is 100, and that the standard deviation is 20 points. Find the probability that the mean aptitude test score for a randomly selected group of 150 8th graders is between 102.5 and 97.5. Click here to see answer by stanbon(60778)

 Question 675571: PLEASE HELP!!!! Suppose a charitable organization decides to raise money by raffling a trip worth \$500. If 3000 tickets are sold at \$1 each, find the expected net winnings in dollars for a person who buys 1 ticket. Click here to see answer by MathLover1(7480)

 Question 675607: http://www.algebra.com/algebra/homework/Probability-and-statistics/Probability-and-statistics.faq.question.673004.html can someone please explain this question? what do the C's mean in the first two lines? thanks. Click here to see answer by KMST(2478)

 Question 675624: Suppose certain coins have weights that are normally distributed with a mean of 5.338 g and a standard deviation of 0.068 g. A vending machine is configured to accept those coins with weights between 5.208 g and 5.468 g. a. If 250 different coins are inserted into the vending machine, what is the expected number of rejected coins? The expected number of rejected coins is____(Round to the nearest integer) ______________________________________________ If you could tell me how to do it rather than just give the answer that be helpful considering that kind of the point. Since i been following the example and i keep getting the wrong answer(online homework, infinite # of tries at the cost of 0.5 reduced per retry). Its kinda frustrating, since i been following the damn example and even other methods that i found googling. Also if you can explain it by using the TI-83 calculator that would be even better. What i been doing is (x-median)/Standard devuation, so: (5.208-5.338)/0.068 and (5.468 -5.338)/0.068 to get the Z score. After that i find the area to the right and left. Since i don't remember the formula or i don't know it. I google to look for it and i think its this one. http://homepage.smc.edu/mcgraw_colleen/math_52/Finding%20%20p-values.pdf So i do this after. Calculator TI-83 normalcdf(-10,result of (5.208-5.338)/0.068,) and normalcdf(result of(5.468 -5.338)/0.068,10) After that i sum their answers and finally i multiply it by 250. I haved tried but it says its wrong(only 3 tries till the right answer) Ty for your help. Click here to see answer by ewatrrr(11176)

 Question 675613: Consider the approximately normal population of heights of male college students with mean μ = 70 inches and standard deviation of σ = 6.4 inches. A random sample of 10 heights is obtained. Find the proportion of male college students whose height is greater than 72 inches. (Give your answer correct to four decimal places. I have worked this out several times and still get the same answer which is incorrect. HELP. Thanks Click here to see answer by ewatrrr(11176)

 Question 675662: Consider a binomial experiment with n=7,trials where the probability of sucess on a single trial is p=0.30, (a) Find P(r=0). (b) Find P(r <1) by using the compliment rule. sfdcapt3@yahoo.com Click here to see answer by stanbon(60778)

 Question 675623: d) The probability that one person will recover from a tropical disease is 0.8. Find the probability that seven of 10 persons will recover from this disease by using binomial probability formula Click here to see answer by stanbon(60778)

 Question 675733: can you please advise how to solve a P(at most ...), at least type probability type questions For example x P(x) 0 .07 1 .68 2 .21 3 .03 4 .01 The questions state find P for at least 1 cc and the P for at most 2 cc Click here to see answer by ewatrrr(11176)

 Question 675744: what the probability that exacly 4 boys in 10 births Click here to see answer by ewatrrr(11176)

 Question 675675: A tube of Listerine Tartar Control toothpaste contains 4.2 ounces. As people use the toothpaste, the amount remaining in any tube is random. Assume the amount of toothpaste remaining in the tube follows a uniform distribution. From this information, we can determine the following information about the amount remaining in a toothpaste tube without invading anyone’s privacy. How much toothpaste would you expect to be remaining in the tube? What is the standard deviation of the amount remaining in the tube? What is the likelihood there is less than 3.0 ounces remaining in the tube? What is the probability there is more than 1.5 ounces remaining in the tube? Click here to see answer by stanbon(60778)

 Question 675674: The payouts for the Powerball lottery and their corresponding odds and probabilities of occurrence are shown below. The price of a ticket is \$1.00. Find the mean and standard deviation of the payout. Hint: Don't forget to include the cost of the ticket and its corresponding probability. Click here to see answer by stanbon(60778)

 Question 675914: Would someone kindly help me with this problem please? 98% confidence interval estimate for a population mean was computed to be (45.9, 60.5). Determine the mean of the sample, which was used to determine the interval estimate (show all work) Click here to see answer by stanbon(60778)

 Question 675916: I KNOW THIS QUESTION HAS BEEN ASKED! I NEED SOME HELP UNDERSTANDING. ITS PROBABLY SOMTHING SIMPLE. THANKS FOR YOU HELP! A card is selected from a deck of 52 playing cards. Find the probability of selecting · an even number ten or less given the card is a not a diamond. · an Ace, given that the card is black. · a spade given the card is red. Click here to see answer by stanbon(60778)

 Question 675981: 1. The following table displays the number of children in a local town classified as normal weight, overweight and obese by year in school. Normal Weight Overweight Obese Total Elementary 50 120 80 250 Middle 30 45 45 120 Junior High 50 50 40 140 High School 30 85 85 200 Total 160 300 250 710 A. What proportion of the children are obese? B. What proportion of the elementary school children are overweight or obese? C. What proportion of the normal weight children are in high school? Click here to see answer by khv_maths(12)

 Question 676143: Find the binomial probability P(x = 6), where n = 15 and p = 0.50. P(x=6) = 15C6(0.5)^6*0.5^9 = Click here to see answer by jim_thompson5910(29613)

 Question 676203: How do I figure out a standard deviation and variance? Any easy ways to understand this? Find the range, standard deviation, and variance for the following sample data: 87,75,58,29,21,19,80,27,61,77,26,16,79,1,68,10 Click here to see answer by jpvn2015(51)
 Question 676203: How do I figure out a standard deviation and variance? Any easy ways to understand this? Find the range, standard deviation, and variance for the following sample data: 87,75,58,29,21,19,80,27,61,77,26,16,79,1,68,10 Click here to see answer by solver91311(18785)

 Question 676334: please help me with this question:A box contains 25 yellow, 26 green and 36 red jelly beans. If 13 jelly beans are selected at random, what is the probability that: 10 are yellow? 10 are yellow and 2 are green and at least one is yellow? Click here to see answer by stanbon(60778)

 Question 676296: There are eight bulbs in a box, five of which are defective. If three bulbs are selected at random, without replacement, find the following probability: (a) All three are defective. (b)None are defective. Click here to see answer by stanbon(60778)

 Question 676511: A and B play for a prize to win 1000 Birr. A is to throw a die first and to win if he throws 6. If A fails, B is to throw and to win if he throws 5 or 6. If B fails, A is to throw again to win if throws 4, 5 or 6, and so on. a. Find the total probabilities of A’s success Click here to see answer by edjones(7794)

 Question 676604: The odds against True Colors winning the Rosenthal Classic Horse Race are 5:2. What is the probability that the True Colors wins the race? Click here to see answer by Eva18(13)

 Question 676637: Find the probability of receiving more than two calls in a five-minute interval of time. Click here to see answer by ewatrrr(11176)