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- 1. Multiple Choice
What is the the total probability under the normal distribution curve?
10%
25%
.5%
100%
- 2. Multiple ChoiceThe normal curve is symmetrical about the mean.TrueFalse
- 3. Multiple Choice
Between what two standard deviations of a normal distribution lies 68% of the data?
one below and one above
two below and two above
two below and zero
zero and two above
- 4. Multiple Choice
Between what two standard deviations of a normal distribution lies 95% of the data?
one below and one above
two below and two above
two below and zero
zero and two above
- 5. Multiple ChoiceIn a factory, the weight of the concrete poured into a mold by a machine follows a normal distribution with a mean of 1150 pounds and a standard deviation of 22 pounds. Approximately 95% of molds filled by this machine will hold weights in what interval?1084 to 1216 pounds1106 to 1150 pounds1106 to 1194 pounds1128 to 1172 pounds
- 6. Multiple Choice
This data is normally distributed. What percent of the data is in the shaded region?
68%
95%
99.8%
50%
- 7. Multiple Choice
This data is normally distributed. What percent of the data is in the shaded region?
68%
95%
99.8%
50%
- 8. Multiple Choice
This data is normally distributed. What percent of the data is in the shaded region?
68%
95%
99.8%
50%
- 9. Multiple Choice
This data is normally distributed. What percent of the data is in the shaded region?
68%
32%
16%
50%
- 10. Multiple Choice
This data is normally distributed. What percent of the data is in the shaded regions?
5%
95%
2.5%
50%
- 11. Multiple ChoiceThis data is normally distributed. What percent of the data is in the shaded region?5%95%2.5%50%
- 12. Multiple Choice
This data is normally distributed. What percent of the data is in the shaded region?
99.8%
0.2%
0.15%
50%
- 13. Multiple Choice
A grading scale is set up for 1000 students’ test scores. It is assumed that the scores are normally distributed with a mean score of 75 and a standard deviation of 15. Calculate the score that lies 2 standard deviation below the mean.
60
475
45
9500
- 14. Multiple Choice
In an Oreo factory, the mean mass of a cookie is given as 40 g. For quality control, the standard deviation is 2 g. If 10 000 cookies were produced, how many cookies are within 2 g of the mean?
6800
9500
3200
9750
- 15. Multiple Choice
The shelf life of a particular dairy product is normally distributed with a mean of 12 days and a standard deviation of 3 days. About what percent of the products last between 12 and 15 days?
68%
99.7%
95%
34%
- 16. Multiple Choice
The speeds of cars on the highway have a mean of 95 km/h with a standard deviation of 5 km/h. What percentage of cars averaged less than 85 km/h?
.15%
2.35%
2.5%
18.5%
- 17. Multiple Choice
The mean life of a tire is 30 000 km. The standard deviation is 2000 km. 68% of all tires will have a life between ______km and ______km.
26000 and 34000
28000 and 32000
24000 and 34000
22000 and 36000
- 18. Multiple Choice
Which set of exam data better represents a normal distribution?
Exam 2
Exam 1
Neither
Both
- 19. Multiple Choice
Which distribution has the smallest standard deviation?
red
yellow
green
blue
they are all the same
- 20. Multiple Choice
Which distributions have the same mean? Check all that apply.
red
yellow
green
blue
none of them have the same mean
- Answer choicesTagsAnswer choicesTags