Exhibit 4-3.The 150 residents of the town of Wonderland were asked their age and whether they preferred vanilla,chocolate,or swirled frozen yogurt.The results are displayed next. Refer to Exhibit 4-3.What is the probability a randomly selected customer prefers chocolate swirled yogurt or is at least 25 years old?

Question

Exhibit 4-3.The 150 residents of the town of Wonderland were asked their age and whether they preferred vanilla,chocolate,or swirled frozen yogurt.The results are displayed next.  Refer to Exhibit 4-3.What is the probability a randomly selected customer prefers chocolate swirled yogurt or is at least 25 years old?

Quizplus · Accepted Answer

To find the probability of a customer preferring chocolate-swirled yogurt or being at least 25 years old, we need to add the probabilities of two events: 
1) the probability of preferring chocolate-swirled yogurt, which is 35/150 = 0.2333
2) the probability of being at least 25 years old, which is the sum of the probabilities of being 25-34 and 35 or older: (35+40)/150 = 0.5

Therefore, the probability of either event happening is 0.2333 + 0.5 = 0.77 or 77%. The correct answer is C.