SOLUTION: A test involving 340 men ages 20 to 24 found that their blood cholesterol levels had a mean of 189 mg/dl and a standard deviation of 44.7 mg/dl. (a) Determine the z-score, to the

Question 1133253: A test involving 340 men ages 20 to 24 found that their blood cholesterol levels had a mean of 189 mg/dl and a standard deviation of 44.7 mg/dl.
(a) Determine the z-score, to the nearest hundredth, for one of the men who had a blood cholesterol level of 216 mg/dl.
z216 =

(b) The z-score for one man was
−1.54.
What was his blood cholesterol level? Round to the nearest hundredth.
mg/dl
Answer by rothauserc(4718) (Show Source): You can put this solution on YOUR website!
a) z-score = (216 - 189)/44.7 = 0.604 is approximately 0.60
:
b) -1.54 = (X - 189)/44.7
:
X - 189 = -68.838
:
X = 189 - 68.838 = 120.162 is approximately 120.16
:
His blood cholesterol level is 120.16
:

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