An engineer is going to redesign an ejection seat for an
airplane. The seat was designed for pilots weighing between 120 lb
and 171 lb. The new population of pilots has normally distributed
weights with a mean of 129 lb and a standard deviation of 33.8 lb.
If 40 different pilots are randomly selected, find the probability
that their mean weight is between 120 lb and 181 lb. The
probability ______is approximately nothing
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