Probability and stats Practice problems Questions & Answers

Probability and stats Practice problems Questions & Answers 10 groups of 5 students spin the spinner shown. If each student spins the spinner 6 times, what is the expected number of times the spinner would land on A for all 10 groups of students? There is an equal chance the spinner lands on A, B, or C. - ANSWER: 100 A 6-sided die is rolled 100 times with the results shown in the table. Outcome 1 2 3 4 5 6 Frequency 20 18 22 20 16 4 What is the experimental probability of rolling a 3? - ANSWER: 11/50 A bin of balls in gym has 60 total balls. 15 are soccer balls and the rest are a mixture of volleyballs and basketballs. If one ball is taken at random, the probability of drawing a basketball is 4/15. How many of the balls are volleyballs? - ANSWER: 29 A class of students is learning about sampling methods and are told to ask people whether they prefer going for a walk or napping. Students bring back the results after sampling parents, siblings, and friends. Which type of sampling method best describes how the students obtained their results? - ANSWER: convenience sampling A combination lock is opened by setting each of five barrels to the correct digit. If digits are randomly chosen from the digits 0 through 9, how many unique combinations can be generated? Repetition of numbers is allowed. - ANSWER: (10^5) A grocery store in a small town plotted the number of items bought per visit versus the shopper's age. The linear regression equation of the data is y = -1.12x + 100 and r2 = 0.62. Which of the following represents the value of the coefficient of determination? - ANSWER: 0.62 A grocery store in a small town plotted the number of items bought per visit versus the shopper's age...............................................