Download 1. The mean life of a tire is 30000 km. The standard deviation is

1
Unit 4 and Unit 3 Review
Name: ____________________
Answer these questions. Review is due tomorrow.
For question 1 and 2, construct a normal distribution curve and label the horizontal axis. Then
answer each question.
1. The mean life of a tire is 30,000 km. The standard deviation is 2000 km.
_______________________________________________
a) 68% of all tires will have a life between __________km and ________ km.
b) 95% of all tires will have a life between __________ km and ________ km.
c) What percent of the tires will have a life that exceeds 26,000 km? ___________
2. The shelf life of a particular dairy product is normally distributed with a mean of 12 days and a
standard deviation of 3 days.
_________________________________________________
a)
b)
c)
d)
About
About
About
About
what percent of
what percent of
what percent of
what percent of
the products last between 9 and 15 days? ______
the products last between 12 and 15 days? _______
the products last 6 days or less? ________
the products last 15 or more days? _________
3. A normal distribution of scores has a standard deviation of 10. Find the z-scores corresponding
to each of the following values:
a) A score that is 20 points above the mean.
b) A score that is 10 points below the mean.
c) A score that is 15 points above the mean
d) A score that is 30 points below the mean.
2
Unit 4 and Unit 3 Review
Name: ____________________
4.
Statements
5.
Reasons
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Unit 4 and Unit 3 Review
Name: ____________________
6.
7.