A test involving 340 men ages 20 to 24 found that their blood cholesterol levels had a mean of 188 mg/dl and a standard deviation of 44.3 mg/dl. (a) Determine the z-score, to the nearest hundredth, for one of the men who had a blood cholesterol level of 215 mg/dl.

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A test involving 340 men ages 20 to 24 found that their blood cholesterol levels had a mean of 188 mg/dl and a standard deviation of 44.3 mg/dl.

(a) Determine the z-score, to the nearest hundredth, for one of the men who had a blood cholesterol level of 215 mg/dl.
 


(b) The z-score for one man was 
−1.57.
 What was his blood cholesterol level? Round to the nearest hundredth.
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