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The mean amount purchased by each customer at Churchill’s Grocery Store is $20 with a standard...

The mean amount purchased by each customer at Churchill’s Grocery Store is $20 with a standard deviation of $9. The population is positively skewed. For a sample of 50 customers, answer the following questions:

a. What is the likelihood the sample mean is at least $22? (Round the z-value to 2 decimal places and the final answer to 4 decimal places.)

Sample mean:

b. What is the likelihood the sample mean is greater than $17 but less than $22? (Round the z-value to 2 decimal places and the final answer to 4 decimal places.)

Sample mean:

c. Within what limits will 98% of the sample means occur? (Round the final answers to 2 decimal places.)

Sample mean : ___ and ____

Math   Statistics-And-Probability   
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