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Case 1 The amount of money spent by Safeway customers is normally distributed with mean 140...

Case 1

The amount of money spent by Safeway customers is normally distributed with mean 140 and a standard deviation of 12. Suppose that a sample of 64 customers are selected. Answer the following questions.

What is the mean of the sampling distribution?

140

150

170

240

What is the standard error of the sampling distribution?

1.23

1.50

1.55

1.20

What is the probability that the average spending by the customers is greater than 144?

0.9962

0.9966

0.0038

0.0048

What is the probability that the average spending by the customers is less than 144?

0.9962

0.9966

0.0038

0.0048

Symmetric about its mean implies:

Mean, mode and median are equal

Mean, mode and median are unequal

Only mean and mode are equal

None of the above

math   Statistics-And-Probability   
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