# Quiz 6 Pre-Assessment

## Quiz by Monica Hyjek

Probability and Statistics
Mathematics
Virginia Standards of Learning

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6 questions
• Q1
Washing machine life spans are normally distributed, with a mean of 14.6 years and standard deviation of 3.7 years. The 10% of washing machines with the shortest lifespans will last how many years or less ?
6.0
9.9
23.2
19.3
30s
• Q2
Given a standard normal distribution, what is the probability that a randomly selected value will be less than -1.4?
83.8%
91.9%
8.1%
16.2%
30s
AII.11.c
• Q3
Washing machine life spans are normally distributed, with a mean of 14.6 years and standard deviation of 3.7 years. What percent of washing machines should we expect to last over 20 years ?
92.78%
7.09%
7.22%
72.22%
30s
• Q4
Given a standard normal distribution, what z-score is found at the 4th percentile?
-1.75
0.25
-0.25
1.75
30s
• Q5
Given a standard normal distribution, what is the probability that -1.2<z<2.7?
88.15%
11.85%
88.49%
99.65%
30s
• Q6
Washing machine life spans are normally distributed, with a mean of 14.6 years and standard deviation of 3.7 years. What age washing machine would fall in the top 1%?
10 years and over
23 years and over
6 years and under
19 years and over
30s

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