A First Course in Probability (10th Edition)
10th Edition
ISBN: 9780134753119
Author: Sheldon Ross
Publisher: PEARSON
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Question
An elevator has a placard stating that the maximum capacity is 3700 Ib-26 passengers. So, 26 adult male passengers can have a mean weight of up to
3700 / 26 = 142 pounds. Assume that weights of males are normally distributed with a mean of 187 lb and a standard deviation of 38 Ib.
a. Find the probability that 1 randomly selected adult male has a weight greater than 142 Ib.
b. Find the probability that a sample of 26 randomly selected adult males has a mean weight greater than 142 Ib
c. What do you conclude about the safety of this elevator?
a. The probability that 1 randomly selected adult male has a weight greater than 142 lb is
__.
(Round to four decimal places as needed.)
b. The probability that a sample of 26 randomly selected adult males has a mean weight greater than 142 lb is __.
(Round to four decimal places as needed.)
c. Does this elevator appear to be safe?
O A. No, because 26 randomly selected people will never be under the weight limit.
O B. Yes, because there is a good chance that 26 randomly selected people will not exceed the elevator capacity.
O C. No, because there is a good chance that 26 randomly selected adult male passengers will exceed the elevator capacity.
O D. Yes, because 26 randomly selected adult male passengers will always be under the weight limit.
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