[Steps Shown] The average time it takes a group of adults to complete a certain achievement test is 46.2 minutes. The standard deviation is 8 minutes. Assume
Question: The average time it takes a group of adults to complete a certain achievement test is 46.2 minutes. The standard deviation is 8 minutes. Assume the variable is normally distributed.
- Find the probability that a randomly selected adult will complete the test in less than 43 minutes.
- Find the probability that, if 50 randomly selected adults take the test, the mean time it takes the group to complete the test will be less than 43 minutes.
- Does it seem reasonable that an adult would finish the test in less than 43 minutes? Explain.
- Does it seem reasonable that the mean of the 50 adults could be less than 43 minutes?
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