Math 227 - Statistics » Spring 2023 » 10P The Standard Normal Distribution & Real Applications of Normal Distributions
Need help with your exam preparation?
Get Answers to this exam for $6 USD.
Get Answers to all exams in [ Math 227 - Statistics ] course for $25 USD.
Existing Quiz Clients Login here
Question #1
Draw the standard normal distribution. Shade the area between the z-score of -1.46 and 0.84. Find the shaded area. Round to the nearest ten-thousandth.
A.
0.8176
B.
0.7274
C.
0.7416
D.
0.9315
Question #2
Draw the standard normal distribution. Shade the area between the z-score of -1.46 and 4.52. Find the shaded area. Round to the nearest ten-thousandth.
A.
0.8744
B.
0.9279
C.
0.9134
D.
0.8346
Question #3
Draw the standard normal distribution. The shaded area to the right of the z-score is 0.0764. Find the z-score. Round to the nearest hundredth.
A.
1.43
B.
1.29
C.
1.18
D.
1.47
Question #4
Suppose that replacement times for washing machines are normally distributed with a mean of 9.8 years and a standard deviation of 2.8 years. Find the replacement time that separates the top 10.2% from the rest. Round to the nearest hundredth.
A.
19.72
B.
13.36
C.
11.96
D.
12.39
Question #5
Scores on a test are normally distributed with a mean of 123 and a standard deviation of 20. What percent of scores are more than 135. Express the answer as a percentage rounded to the nearest hundredth without the % sign.
A.
26.52
B.
22.48
C.
27.43
D.
26.55
Need help with your exam preparation?
Get Answers to this exam for $6 USD.
Get Answers to all exams in [ Math 227 - Statistics ] course for $25 USD.
Existing Quiz Clients Login here