In a study of 292,802 cell phone users, it was found that 70 developed cancer of the brain or nervous system. Assuming that cell phones have no effect, there is a 0.000251 probability of a person...

Extracted text: In a study of 292,802 cell phone users, it was found that 70 developed cancer of the brain or nervous system. Assuming that cell phones have no effect, there is a 0.000251 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 292,802 people. Estimate the probability of 70 or fewer cases of such cancer in a group of 292,802 people. What do these results suggest about media reports that cell phones cause cancer of the brain or nervous system? ..... (a) P(xs 70) = (Round to four decimal places as needed.)