Question

Suppose the local Best Buy store averages 522 customers every day entering the facility with a...

Suppose the local Best Buy store averages 522 customers every day entering the facility with a standard deviation of 124 customers. A random sample of 40 business days was selected. What is the probability that the average number of customers in the sample is between 530 and 540?

0.2387

0.0357

0.1621

0.0572

(no excel work)

Math   Statistics-And-Probability   
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Answer #1

mean of sample average= 522

standard deviation of sample average= /√n

= 124/√40

= 19. 606

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