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Answer:
0.04
Step-by-step explanation:
Given that :
Mean(m) = 150
Standard deviation (s) = 20
Find P(X<115)
Obtain the Zscore :
(x - m) / s
(115 - 150) / 20
P(X<115) = - 1.75
Using the Z probability calculator :
P(Z < - 1.75) = 0.040059
P(Z < - 1.75) = 0.04