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

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 Question 565279: Determine P97, the ninety-seventh percentile of the standard normal distribution. Fine the z so that the area below is 0.9700. Click here to see answer by stanbon(60771)

 Question 565272: For a binomial random variable with n=6 and π=0.7, P(5)=? Click here to see answer by stanbon(60771)

 Question 565269: A production facility employs 20 workers on the day shift, 15 workers on the swing shift, and 10 workers on the graveyard shift. A quality control consultant is to select 6 of these workers for in depth interviews. Suppose the selection is made in such a way that any particular group of 6 workers has the same chance of being selected as does any other group (drawing 6 slips without replacement from among 45). What is the probability that at least two different shifts will be represented among the selected workers? Click here to see answer by stanbon(60771)

 Question 565480: What is the probability that all three persons born on 4th of July Click here to see answer by stanbon(60771)

 Question 565501: A multiple-choice test has 20 questions. There are four choices for each question. A student comes to class with four different colored balls of identical shape and size in her pocket. She has decided to draw one ball from her pocket per question and allow the color of the ball to select the answer for each question. What type of probability distribution can be used to figure out her chance of getting 10 questions right? Click here to see answer by stanbon(60771)

 Question 565264: If there is one defective screw out of every 80 that are made . How many screws would be defective if 5600 are made Click here to see answer by stanbon(60771)

 Question 565523: A fast food restaurant gives away a toy with each children's meal. There are 4 different toys given away randomly. How many meals will the family have to buy to get all 4 toys? What is the probability involved? (I think it is (1/4)^4 or 1/256, but am I wrong? Is it 4C1 or 1/6?) Would the family have to buy 4! meals? Click here to see answer by stanbon(60771)

 Question 565575: What is the probability that a mother will recieve a gift of flowers or plants? Write the probability as a fraction. Use the graph card - 79%, flowers/plants - 52%, dinner/brunch - 23%, gradening items - 22% apparel - 19%, jewelry - 17%, home decor - 11% Out of 400 mothers that reciee gifts, predict how many will receive flowers or plant. Click here to see answer by stanbon(60771)

 Question 565674: 3. You roll a six-side die. Find the probability of each event. 6 point ( Round answer to three decimals) a. P(rolling a 3) = b. P (rolling a 7)= c. P rolling a number less than 5) Click here to see answer by ad_alta(240)

 Question 565582: A vertical line is drawn through a normal distribution at z = -0.50. What proportion of the distribution is located between the mean and the line? Click here to see answer by stanbon(60771)

 Question 565592: how many counting numbers between 100 and 1000 have at least one 2 as a digit? Click here to see answer by stanbon(60771)

 Question 565258: Eight people are going to line up to get on a bus. Three of those people are husband, wife and (2.5 pts) their daughter that must follow each other when they line up to get on the bus. How many ways are possible for the line up? Click here to see answer by stanbon(60771)

 Question 565415: Clark Heter is an industrial engineer at Lyons Products. He would like to determine whether there are more units produced on the night shift than on the day shift. Assume the population standard deviation for the number of units produced on the day shift is 21 and is 28 on the night shift. A sample of 54 day-shift workers showed that the mean number of units produced was 345. A sample of 60 night-shift workers showed that the mean number of units produced was 351. At the .05 significance level, is the number of units produced on the night shift larger? Click here to see answer by stanbon(60771)

 Question 566307: Tamika has \$2.50 in quarters in her pocket,including four stgate quarters. She reaches into her pocket and takes out two quarters, one at a time. What is the probablility that they are both state quarters? Click here to see answer by stanbon(60771)

 Question 566291: 45% of men consider themselves professional baseball fans.You randomly select 10 men and ask each if he considers himself a professional baseball fan. Find the probability that number considers themselves a baseball fan is (a) exactly eight (b) at least 8 and (c) less than eight. (a) P(8) = ______ round to nearest thousandth (b) (x is greater than or equal to 8) = ______ round to nearest thousandth (c) P(x<8) = _______ round to nearest thousandth Click here to see answer by stanbon(60771)

 Question 566380: If you have 12 \$1.00 bills, 5 \$2.00 bills, 2 \$20.00 bills, and 1 \$50.00, make a probability distribution table and find the expected value. Click here to see answer by richard1234(5390)

 Question 566515: An ice cream parlor has 20 different flavors. Cynthia orders a banana split and has to select 3 different flavors. How many different selections are possible? Click here to see answer by stanbon(60771)

 Question 566408: Assume that a population is normally distributed with a mean of 100 and a standard deviation of 15. Would it be unusual for the mean of a sample of 3 to be 115 or more? Click here to see answer by stanbon(60771)

 Question 566612: There are 7 men and 3 women in a room. Two of these 10 people are selected at random. If both people are the same gender, then what is the probability that they are both women? Click here to see answer by Theo(3552)

 Question 566666: What is the probablity that a seven-digit telephone number has one or more repeated digits? Assume no one digit is more likely than another to be used. In addition, the leading digit cannot be zero. Click here to see answer by stanbon(60771)

 Question 566648: If I attempted 23 freethrows and made 15 of them, what is the probability that I will make my next attempt. Click here to see answer by stanbon(60771)
 Question 566648: If I attempted 23 freethrows and made 15 of them, what is the probability that I will make my next attempt. Click here to see answer by Alan3354(34674)

 Question 566641: What is the probability that the student is a freshman given he doesn’t carry a credit card? Class Credit Card Carrier Not a Credit Card Carrier Total Freshman 33 27 60 Sophomore 6 24 40 Total 39 61 100 (Points : 3) Click here to see answer by stanbon(60771)

 Question 566685: From experience, Teton Tire knows the probability is .95 that a particular XB-70 tire will last 60,000 miles before it becomes bald or fails. An adjustment is made on any tire that does not last 60,000 miles. You purchase 4 XB-70’s. a. (10 pts) What is the probability that all 4 tires will last at least 60,000 miles? b. (10 pts) What is the probability that none of the tires will last at least 60,000 miles? Click here to see answer by Theo(3552)

 Question 566732: A medical researcher wants to find the probability that a heart patient will survive for one year. He reasons that there are 2 outcomes (survives, does not survive), so the probability is 1/2. Is he correct? What important information is not included in his reasoning process? Click here to see answer by jim_thompson5910(29613)

 Question 566859: you want to determine the typical dietary habits of students at a college. which would be the best sample to represent a typical student. *students in a single dormitory *students majoring in public health *students who participate in intercollegiate sports *students enrolled in a required English course. Why? explain why each of the other choices would not make a good sample for this study. Click here to see answer by jim_thompson5910(29613)

 Question 566601: From five different books, A,B,C,D and E, three are selected. List a suitable sample space of outcomes. In your sample space: a.) How many sample points correspond to a selection including A? b.) How many sample points correspond to a selection without A? c.) How many correspond to a selection including both B and C? d.) How many selections include either D or E? Click here to see answer by Edwin McCravy(9716)

 Question 567195: On a math test, 5 out of 20 students got an "A". If 2 out of the 20 students are chosen at random, what is the probability that all 3 got an "A" on the test? Click here to see answer by stanbon(60771)

 Question 567102: A student is to select 3 classes for next semester. If this student decides to randomly select one course from each of 5 economics classes, 9 math classes, and 5 conputer classes, how many sifferent outcomes are possible. Please explain. Click here to see answer by richard1234(5390)

 Question 567216: A contestant correctly answered 9 of 12 questions correctly. Find the probability of the contestant answering the next question correctly Click here to see answer by richard1234(5390)

 Question 567330: Find the z-score for the value 50, when the mean is 77 and the standard deviation is 8. Click here to see answer by stanbon(60771)

 Question 567302: 120 students were selected among all those at college number 1. 30 of them are sophomores. Find the margin of error Click here to see answer by stanbon(60771)

 Question 567359: Two students, Jim and Joan are registered for the same class and attend independently to each other, Jim 91,9% of the time and Joan 84.3% of the time. What is the probability that on any given day a) at least on of them will be in class? b) neither will be in class? Click here to see answer by stanbon(60771)

 Question 567379: what is the probability of getting the first seven responses on a multiple choice test, with three possible answers each, correct then the last three wrong? Click here to see answer by richard1234(5390)

 Question 567524: In the formula for the Confidence Interval for the Mean, if the Confidence Coefficient, z(α/2) = 2.58, what is the Confidence Level? Click here to see answer by stanbon(60771)

 Question 567605: In how many ways can we select 3 marbles from a box containing 5 red, 4 blue and 3 white marbles? a. If there is no restrictions. b. 1 of each color. c. 2 blue and 1 white. d. 1 red. e. No blue. Click here to see answer by stanbon(60771)

 Question 567696: how many numbers between 100 and 1000 have at least one 2 in the number Click here to see answer by Edwin McCravy(9716)
 Question 567696: how many numbers between 100 and 1000 have at least one 2 in the number Click here to see answer by richard1234(5390)

 Question 567771: Over the past 30 years in the US there has been a strong negative correlation between the number of infant deaths at birth and the number of people over the age 65. Is the fact that people are living longer causing a decrease in infant deaths at birth? What lurking variables might be causing the increase in one or both of the variables? Explain. Click here to see answer by stanbon(60771)