College Math

College Math Study Guide

Question 7: Two dice are rolled together. What is the probability that the total sum on both dice is 8? a. 13.89% b. 86.11% c. 27.78% d. 41.67% Question 8: A box has two kinds of marbles, red and blue. A kid draws two marbles from the box. The probability of drawing a red and blue marble is 0.32 and the probability of drawing a red marble is 0.47. If it is known that the first marble drawn was blue, what is the probability that the second would be red? a. 72% b. 68% c. 55% d. 27% Question 9: A survey was conducted among 100 families and was asked two questions- if they ate healthy foods and whether they undertake regular exercise. Out of the sample, 48 people said that they eat healthy food, while 65 said that they do not exercise regularly. 44 people said that they neither eat healthy foods nor do exercise and 27 people do both. Find the probability of people who exercise regularly, given that they eat healthy food. a. 19% b. 65% c. 87% d. 56%

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