Solution :
Given that,
mean =
= 63.2
standard deviation =
= 11.7
P( Z < z) = 81%
P(Z < z) = 0.81
z = 0.878
Using z-score formula,
x = z *
+
x = 0.878* 11.7 + 63.2
= 73.47
P81 = 73.47
Option A ) is correct.
Scores on a test are normally distributed with a mean of 63 2 and a standard...
Scores on a test are normally distributed with a mean of 63.2 and a standard deviation of 11.7. Find P81, which separates the bottom 81% from the top 19%. Round to two decimal places. A. 0.88 B. 73.47 C. 66.60 D. 0.29
Scores on a test are normally distributed with a mean of 63.2 and a standard deviation of 11 7 Find P81 , which separates the bottom 81% from the top 19%, Round to two decimal places. O A. 66.60 O B. 0.29 ОС. 088 O D. 73.47
Scores on a test are normally distributed with a mean of 63.2 and a standard deviation of 11 7 Find P81 , which separates the bottom 81% from the top 19%, Round to...
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