# 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 605858: The movie rating Web site Rotten Tomatoes reported that 92 percent of a sample of 39 movie critics hated the 2005 horror movie The Fog. Is the 92 percent figure a statistic or a parameter? A. Parameter B. Statistic Click here to see answer by jim_thompson5910(28595)

 Question 605989: In how many ways can you choose a committee of 7 from a total of 20 people Click here to see answer by Sarey(4)

 Question 606006: Two cards are drawn from a well-shuffled deck of 52 playing cards. Let X denote the number of aces drawn. Find P(X = 2). (Round your answer to three decimal places.) Click here to see answer by stanbon(57377)

 Question 605985: Question One: Scores on a test are normally distributed with a mean of 541 and a standard deviation of 120. Use the 68-95-99.7 Rule to find the percentage of people taking the test who score below 181. Click here to see answer by stanbon(57377)

 Question 605958: Four cards with "girl" printed on them and five cards with "boy" printed on them are shuffled and placed face-down on a table. A card is drawn, and without replacing it, a second card is drawn. What is the probability that both cards have "girl" written on them Click here to see answer by stanbon(57377)

 Question 606318: a bag contains 5 red marbles and 4 white marbles. a marble is selected from the bag and then repleced before a second marble is choose. what is the probability of choosing two red marbles? Click here to see answer by stanbon(57377)

 Question 606273: expert hits a target 95% of the times. What is the probability that the expert will miss the target for the first time on the 15'th shot Click here to see answer by Edwin McCravy(8909)

 Question 606336: if you roll a six-sided number cube, what are the possible outcomes Click here to see answer by solver91311(16897)
 Question 606336: if you roll a six-sided number cube, what are the possible outcomes Click here to see answer by richard1234(5390)

 Question 606325: AN URN CONTAINS 5 YELLOW , 12 BLACK , AND 3 WHITE MARBLES. iF ONE MARBLE IS SELECTED , WHAT IS THE PROBABILITY THAT IT IS BLACK? Click here to see answer by vksarvepalli(154)
 Question 606325: AN URN CONTAINS 5 YELLOW , 12 BLACK , AND 3 WHITE MARBLES. iF ONE MARBLE IS SELECTED , WHAT IS THE PROBABILITY THAT IT IS BLACK? Click here to see answer by solver91311(16897)

 Question 606332: Find the probability of getting a prime number in the case that a number is chosen randomly from the set {1,2,3,4,...12} So my thoughts were the prime numbers are 1,2,3,5,7,11 and there are 12 possibilities so the answer should be 1/2. But the answer given to me is 5/12. What am I missing? Click here to see answer by richard1234(5390)

 Question 606466: Here is the problem I am having trouble with (one of the practice question in a subject test study guide book for Math 1): A random number generator will randomly select an integer between 1 and 100, inclusive. What is the probability that the integer selected will be a product of two odd integers greater than 1? A) 25/100 B) 26/100 C) 28/100 D) 29/100 E) 30/100 So, I decided that the integer described must not be a prime number and must be odd itself. I counted how many odd number there are between 1 and 10, then between 11 and 20, then between 21 and 30. There are 4 of them in the first sequence, 5 of them in the second, and 5 of them in the third. There are ten sets of ten in 100, so there are 5(9)+4 odd numbers between 1 and 100, which is 49. The next step is to subtract the # of prime numbers there are from this, but how can i figure out the # of prime #s without having to list them one by one? Thats is quite time consuming... Thank you! Click here to see answer by Edwin McCravy(8909)

 Question 606543: A student in your algebra class is selected at random. One of the remaining students is selected at random. Is it dependent or independent? Click here to see answer by richard1234(5390)

 Question 606620: A multiple choice examination contains 5 questions, each of which 4 options/choices (a,b,c,d). Suppose a student answers by guessing only, what is the probability that a. he will get perfect? b. his answer to all questions are of the same letters? Click here to see answer by stanbon(57377)

 Question 606632: a. How many three digit-numbers can be formed from the digits 1,2,3,4,5 and 6 if each digit can be used only once? b. How many of these are odd? c. How many are greater than 600? Click here to see answer by stanbon(57377)

 Question 606635: Four cards are drawn at random from a deck of playing cards. What is the probability that a. all are spades? (with replacement) b. they are of different kinds? (without replacement) c. there is only one heart? (without replacement) Click here to see answer by stanbon(57377)

 Question 606655: of 30 students in a class, 25 speak french and 20 speak english. each student speaks atleast 1 of these languages. we meet a student from the class at random. what is the probability that this student speaks: 1-both languages. 2-french only. 3-one language only. Click here to see answer by ewatrrr(10682)

 Question 606672: of 34 student. 22 play football, 10 play basketball, and 5 play both. we meet a student from this class at random. what is the probability that this student : _is either exclusively a basketball or a football player. _is neither a basketball nor a football player. with explanation plz...ty Click here to see answer by ewatrrr(10682)

 Question 606629: determine the mean,median and mode of the following sets of number a)8,11,14,13,14,9,15 Click here to see answer by lawdej(58)

 Question 606685: To find the average income of an adult in the United States, 250 workers in Tennessee are questioned. Click here to see answer by mathie123(224)

 Question 606768: Find the probability of a score less than 36 with a mean of 38.3 and a standard deviation of 2.1 Click here to see answer by ewatrrr(10682)

 Question 606542: mean of 70 standard deviation of 12 find the percentage that will fall below 55 Click here to see answer by ewatrrr(10682)

 Question 606839: Players play a game called Spin the wheel you get to spin. You could land on any number 1-40. What would be the probability as a fraction if it was a multiple of 6? Click here to see answer by solver91311(16897)

 Question 606772: four cards are selected, one at a time from a standard deck of 52 cards. Let x represent the number of aces drawn in a set of 4 cards. a) if this experiment is completed without replacement, explain why x is not a binomial random variable. b) if this experiment is completed with replacement explain why x is a binomal random variable Click here to see answer by richard1234(5390)

 Question 606885: What is the probability of drawing a face card or a black card? Click here to see answer by solver91311(16897)

 Question 607178: About 18% of the population is allergic to pollen. If two people are randomly selected, what is the probability both are allergic to pollen? What is the probability at least one is allergic to pollen? a)The probability that both will be allergic to pollen is? b)The probability that at least one is allergic to pollen? Click here to see answer by stanbon(57377)

 Question 607227: Can I please get someone's help on this. Tried and tried but I cant get it. Saw other answers but they didnt match up to the answer provided. Members of the general adult population volunteer an average of 4.2 hours per week. A random sample of 20 female college students and 18 male college students produced the results given in the table below. At the .01 level of significance, is there sufficient evidence to conclude that a difference exists between the mean number of volunteer hours per week for male and female college students? Females Males Sample size 20 18 Sample mean 3.8 2.5 Sample variance 3.5 2.2 Possible answers: A. No, because the test value 2.38 is greater than the critical value B. No, because the test value 2.38 does not exceed the critical value C. No, because the test value 2.90 is greater than the critical value D. Yes, because the test value 2.90 is greater than the critical value Click here to see answer by stanbon(57377)

 Question 607292: The probability that the children in a specific family will have brown eyes is 5/8.If there are six children in the family, what is the probability that at least three of them have brown eyes? (Round your answer to four decimal places.) Click here to see answer by ewatrrr(10682)

 Question 607281: Need help, I cant get the basis for this one. The marketing manager of a large supermarket chain would like to use shelf space to predict the sales of pet food. For a random sample of 12 similar stores, she gathered the following information regarding the shelf space, in feet, devoted to pet food and the weekly sales in hundreds of dollars. Store 1 2 3 4 5 6 7 8 9 10 11 12 Shelf Space 5 5 5 10 10 10 15 15 15 20 20 20 Weekly Sales 1.6 2.2 1.4 1.9 2.4 2.6 2.3 2.7 2.8 2.6 2.9 3.1 1) Compute the value of the sample correlation coefficient between weekly sales and shelf space. possible answers: A. 0.684 ; B. 0.827 ; C. 0.652 ; D. 0.308 Thank you Click here to see answer by ewatrrr(10682)

 Question 607212: Dear tutor, I would really appreciate your help in the following problems. 1. A container holds 15 pennies, 8 nickels, and 10 dimes. You will randomly select two coins without replacement. a. Fill in the probabilities on each branch of the tree diagram. I couldn't put the diagram:( It goes like this: Select select 1st 2nd coin coin Penny Penny-----> Nickle Dime to all ------> Nickle----> Penny Nickle Dime Dime------> Penny Nickle Dime Use the tree diagram to answer the following: How many ways can you select the coins? How many ways can you select exactly 1 nickel? What is the probability that you select 2 pennies? What is the probability that you select a dime and then a penny? 2. The numbers 1 through 50 are written with red marker on slips of paper while the numbers 51 through 100 are written with blue marker on slips of paper. All the papers are put into a bag and shuffled. One card is randomly selected. a. Find the probability of selecting a number less than 10 or a number written in blue. Show your work. b. Find the probability of selecting a number written in red or a multiple of 20. Show your work. 3. There are 12 red checkers and 3 black checkers in a bag. Checkers are selected one at a time, with replacement. Each time, the color of the checker is recorded. Find the probability of selecting a red checker exactly 7 times in 10 selections. Show your work. If you don't get the first question forget it. I'll try someone else. Thank you Click here to see answer by richwmiller(9143)

 Question 607381: body temps: mean of 96.20 standard deviation of .82 If you have a body temp of 97.00 degrees, what is your percentile score? Click here to see answer by ewatrrr(10682)

 Question 607370: the Tafs have three children born in different years draw a tree diagram or list a sample space to show all the possible arrangements of boy and girl children in the Grimaldi family Click here to see answer by lynnlo(4164)

 Question 607541: Select a card. one card is selected at random from a deck of cards. Determine the probability that the card selected is 9, 5 or 7 Click here to see answer by nerdybill(6962)

 Question 607696: For the following scores, find the (a) mean, (b) median, (c) sum of squared deviations, (d) variance, and (e) standard deviation: 1,112; 1,245; 1,361; 1,372; 1,472 Click here to see answer by ewatrrr(10682)

 Question 607794: If five cards are selected from a standard deck of 52 playing cards. What are the odds of Not selecting a heart or a seven? Click here to see answer by stanbon(57377)

 Question 607822: A professor in the chemistry department decides to grade his three students using pass/fail. What is the probability that at least two students will pass? Click here to see answer by stanbon(57377)

 Question 607832: At a certain college, 30% of the students are math majors. If 10 students are selected at random, what is the probability that exactly 3 of them are math majors? Round your answer to three decimal places. Click here to see answer by jim_thompson5910(28595)

 Question 607870: Adrian spins the spinner below that contains numbers 1-8. What is the probability that he spins a prime number? Click here to see answer by lynnlo(4164)

 Question 607889: Please help me solve this question A test consists of 10 true or false questions. If the student guesses on each question: What is the mean number of correct answers? What is the standard deviation of the number of correct answers? Click here to see answer by jim_thompson5910(28595)

 Question 607534: what is the probability of rolling a single die four times and rolling exactly two fives? Click here to see answer by richard1234(5390)

 Question 607768: Ok this is the question as it is written, I have worked on it so long and messed it up so now Im totally confused...When 15 different second year medical students at Fletcher Allen Hospital measured the systolic blood pressure of the same person, they obtained the results listed below (in mmHg). Assuming that the population standard deviation is known to be 10mmHg, use a .05 significance level to test the claim that the mean blood pressure level is less than 140mmHg. Hypertension is defined to be a blood pressure level that is too high (140 mmHg or greater). Based on the hypothesis test results, can it be safely concluded that the person does not have hypertension? 142 133 139 143 125 128 130 134 133 148 146 144 133 150 142 Click here to see answer by richard1234(5390)

 Question 607981: At a car dealer, the average sale price of the car is \$21,500 with a standard deviation of \$2,750. The dealer has 9,000 cars on the lot. A) How many cars are priced at most \$22,300? B) How many cars are priced between \$15,500 and \$18,100? Click here to see answer by ewatrrr(10682)

 Question 607992: Can someone help me with this question and provide answers to the questions? Standard amounts of five different insecticides are found to kill 35%, 45%, 85%, 65% and 90% respectively of a fixed size of insect population. If one of the insecticides is chosen at random, what is the probability that it will kill: a) at least 65% of the insect population? b) at least 45% of the insect population? c) between 40% and 80% of the insect population? d) If two of the insecticides are chosen at random, what is the probability that any one of the pair chosen will kill at least 85% of the insect population? Click here to see answer by ewatrrr(10682)

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