Concept explainers
Lightning Deaths Based on the results given in Cumulative Review Exercise 6, assume that for a randomly selected lightning death, there is a 0.8
a. Find the probability that three random people killed by lightning strikes are all males.
b. Find the probability that three random people killed by lightning strikes are all females.
c. Find the probability that among three people killed by lightning strikes, at least one is a male.
d. If five people killed by lightning strikes are randomly selected, find the probability that exactly three of them are males.
e. A study involves random selection of different groups of 50 people killed by lightning strikes. For those groups, find the mean and standard deviation for the numbers of male victims.
f. For the same groups described in part (e), would 46 be a significantly high number of males in a group? Explain.
6. Lightning Deaths The graph in Cumulative Review Exercise 5 was created by using data consisting of 232 male deaths from lightning strikes and 55 female deaths from lightning strikes. Assume that these data are randomly selected lightning deaths and proceed to test the claim that the proportion of male deaths is greater than 1/2. Use a 0.01 significance level. Any explanation for the result?
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