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The mean amount purchased by a typical customer at Churchill

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The mean amount purchased by a typical customer at Churchill's Grocery Store is $23.50 with a standard deviation of $5.00. Assume the distribution of amounts purchased follows the normal distribution. For a sample of 50 customers, answer the following questions.
a. What is the likelihood the sample mean is at least $25.00?
b. What is the likelihood the sample mean is greater than $22.50 but less than $25.00?
c. Within what limits will 90 percent of the sample means occur

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a. P(Xbar ≥ 25) = P(Z ≥ (25-23.5)/(5/sqrt(50))) = P(Z ≥ 2.12) = ...

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$2.19