The average time taken to complete an exam, X, follows a normal probability distribution with mean...
The average time taken to complete an exam, X, follows a normal probability distribution with mean = 60 minutes and standard deviation 30 minutes. What is the probability that a randomly chosen student will take more than 45 minutes to complete the exam?
Homework Answers
P(X > 45)
= P((X - 
)/
> (45 - )/)
= P(Z > (45 - 60)/30)
= P(Z > -0.5)
= 1 - P(Z < -0.5)
= 1 - 0.3085
= 0.6915
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