Question

In: Statistics and Probability

Suppose a batch of metal shafts produced in a manufacturing company have a standard deviation of...

Suppose a batch of metal shafts produced in a manufacturing company have a standard deviation of 1.5 and a mean diameter of 205 inches.

If 79 shafts are sampled at random from the batch, what is the probability that the mean diameter of the sample shafts would differ from the population mean by less than 0.3 inches? Round your answer to four decimal places.

Solutions

Expert Solution

Solution :

= / n = 1.5 / 79

P(the sample shafts would differ from the population mean by less than 0.3 inches)

= P[ -0.3 / 1.5 / 79    ( - ) /    0.3 / 1.5 / 79)]

= P(-1.78     Z   1.78)

= P(Z   1.78) - P(Z -1.78)

= 0.9249


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