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A normal population has mean μ =40 and standard deviation σ =9. (a) What proportion of...

A normal population has mean μ =40 and standard deviation σ =9.

(a) What proportion of the population is between 20 and 30?

(b) What is the probability that a randomly chosen value will be between 35 and 45?

Round the answers to at least four decimal places.

Math   Statistics-And-Probability   
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