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  3. a manufacturer produces widgets whose lengths are

A manufacturer produces widgets whose lengths are normally distributed with a mean of 8.7 cm and...

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Statistics

A manufacturer produces widgets whose lengths are normallydistributed with a mean of 8.7 cm and standard deviation of 2.5cm.

A. If a widget is selected at random, what is the probability itis greater than 9.1 cm.?

B. What is the standard deviation of the average of samples ofsize 34 ?

C. What is the probability the average of a sample of size 34 isgreater than 9.1 cm? Round answer to four decimal places.

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