8. The presidents of the past century have a mean height of 70.3 inches and a...
8. The presidents of the past century have a mean height of 70.3 inches and a standard deviation of 2.4 inches. William McKinley was 68 inches tall. Calculate the z-score to determine whether Mr. McKinley’s height is considered to be “unusual”. (2 dp)
Homework Answers
Solution :
Given that ,
mean = 
= 70.3
standard deviation =
=
2.4
x = 68
Using z-score formula,
z = x -
/
z = 68 - 70.3 / 2.4
z = - 0.96
standard score = z = - 0.96
The z score - 0.96 is not unusual because z score is between - 2 and 2
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