Rod figures that it takes an average (mean) of =20 minutes with a standard deviation of...
Rod figures that it takes an average (mean) of =20 minutes with a standard deviation of =3 minutes to drive from home, park the car, and walk to an early morning class. Let the random variable X be the commuting time. One day it took Rod 25 minutes to get to class. Convert the commuting time x=25 minutes to a standardized z-score
Homework Answers
Solution :
Given ,
mean = 
= 20
standard deviation = 
= 3
x=25
using z-score formula
z =X -/
z=25 - 20 /3
z=1.67
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