20. Fill in the blank. Historically, the average score of PGA golfers is 72.13 with a standard deviation of 1.825. A random sample of 48 golfers is taken. There is an 86% chance that the average score is less than ________ strokes.
a. 74.1
b. 72.41
c. 73.16
d. 75.85
Solution :
Given that,
mean = = 72.13
standard deviation = = 1.825
n = 48
= 72.13
= / n = 1.825 / 48 = 0.2634
P(Z < z) = 86%
P(Z < 1.08) = 0.86
z = 1.08
= z * + = 1.08 * 0.2634 + 72.13 = 72.41
There is an 86% chance that the average score is less than 72.41 strokes.
option b) is corect
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