Question

2. In a study of 437 comma 485 cell phone​ users, it was found that 54 developed cancer of the brain or nervous system. Assuming that cell phones have no​ effect, there is a 0.000168 probability of a person developing cancer of the brain or nervous system. We therefore expect about 74 cases of such cancer in a group of 437 comma 485 people. Estimate the probability of 54 or fewer cases of such cancer in a group of 437 comma 485 people. What do these results suggest about media reports that cell phones cause cancer of the brain or nervous​ system?

(a) P(X≤54)=

3. In a survey of 1169 ​people, 807 people said they voted in a recent presidential election. Voting records show that 66​% of eligible voters actually did vote. Given that 66​% of eligible voters actually did​ vote, (a) find the probability that among 1169 randomly selected​ voters, at least 807 actually did vote.​ (b) What do the results from part​ (a) suggest?

(a) P(X≥807)

Answer 1