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- 1. Multiple Choice
The volumes of soda in quart soda bottles can be described by a Normal model with a mean of 32.3 oz and a standard deviation of 1.2 oz. What percentage of bottles can we expect to have a volume less than 32 oz?
0.4013
0.2403
0.5204
0.1407
- 2. Multiple Choice
A bank's loan officer rates applicants for credit. The ratings can be described by a Normal model with a mean of 200 and a standard deviation of 50. What percentage of ratings can be expected to be between 200 and 275?
0.4331
0.5671
0.3861
0.2987
- 3. Multiple Choice
The lengths of human pregnancies can be described by a Normal model with a mean of 268 days and a standard deviation of 15 days. What percentage of pregnancies will last at least 300 days?
0.0164
0.9836
0.1234
0.5619
- 4. Multiple Choice
A town's average snowfall is 48 inches per year with a standard deviation of 6 inches. Using a Normal model, what values should border the middle 50% snowfalls?
44 and 52 inches
42 and 54 inches
40 and 50 inches
40 and 60 inches
- 5. Multiple Choice
For a recent English exam, the mean was 73 points and the standard deviation was 9.2 points. Find the percent of scores over 85.
0.0961
0.9039
0.2851
0.7531
- 6. Multiple Choice
For a recent English exam, the mean was 73 points and the standard deviation was 9.2 points. Find the percent of scores under 58.
0.9485
0.0515
0.6521
0.5531
- 7. Multiple Choice
A standardized test has scores that can be described by a Normal model with a mean score was 100 points and a standard deviation of 10 points. What score is at the 25th percentile?
93.26
106.74
90.32
80
- 8. Multiple Choice
A town has a speed limit of 45 mph. If the speeds of cars traveling in the town can be described by a Normal model with a mean of 48 mph and a standard deviation of 3.5 mph, what percent of cars are exceeding the speed limit?
80.43%
19.56%
23.86%
75%
- 9. Multiple Choice
A town's average snowfall is 48 inches per year with a standard deviation of 6 inches. Using a Normal model, what percent of snowfall amounts will be between 40 and 50?
0.5393
0.4607
0.3719
0.7234
- 10. Multiple Choice
A bank's loan officer rates applicants for credit. The ratings can be described by a Normal model with a mean of 200 and a standard deviation of 50. What is the rating which cuts off the bottom 20%?
157.92
242.08
189.34
190.60
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