Transcribed Image Text:10. Find the mean of the following data: l2, 10,15, 10, 16, 12,10,15, 15,
a. 13
b. 12.5
с. 15
d. 12.8
11. Find the mode of the following data: 20, 14, 12, 14, 26, 16, 18, 19, 1
a. 14
b. 17
c. 26
d. 16
12. Find the mean of the following data: 0, 5, 2, 4, o, 5, 0, 3, 0, 5, 0, 3
a. 0
b. 2.25
c. 2.5
d. 3.86
13. Find the mean of the following data: 20, 24, 24, 24, 22, 22, 24, 22, 23, 25
a. 23.5
b. 23
c. 24
d. 16
14. A standard normal distribution has which of the following properties?
a. The mean is equal to the standard deviation.
b. The mean is equal to 0 and the variance is equal to 1.
c. The mean is equal to the variance.
d. The mean and the variance both equal 1.
15. Let z be a normal random variable with a mean of 0 and a standard deviation
of 1. Determine P(z 1.4).
a. 0.9192
b. 0.4192
c. O because P(z = 1.4) = 0.
d. 0,0808
16. In which of the following continuous distributions are extreme values most
likely (within its range) ?
a. Norma1
b. Extreme values are rare for all continuous distributions
c. Uniform
d. d. Exponential
17. In which of the following continuous distributions are extreme values most
likely (within its range) ?
a. Normal
b. Extreme values are rare for all continuous distributions
c. Uniform
d. d. Exponential
18. 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 6 days or less?
a. 68%
b. 34%
c. 16%
d. 2.5%
19. If heights of 3rd graders follow a normal distribution with a mean of 52
inches and a standard deviation of 2.5 inches, what is the z score of a 3rd
grader who is 47 inches tall?
a. -5
b. -2
c. 2
d. 5
Transcribed Image Text:The table at the lower right shows the distribution of scores on
score freq
Freq
11
Score
26
1. Select the statement that is correct.
10
27
12
32
a. 6 people had scores of 11.
b. 27 people had scores of 10.
c. A andB are both correct.
d. All of these are false.
14
31
16
12
18
15
20
2. Find the median quiz score.
a. 13.5
b. 12
c. 31.5
d. 13
3. Find the mean quiz score. (Answers may have been rounded.)
a. 12
b. 12.2
c. 13
d. 13.4
4. Find the mode.
а. 31
b. 7
c. 12
d. 7
The table at right shows the distribution of ACT Math ACT Math freq scores for a
sample of students. The data is authentic.
Score
Freq
5. Select the statement that is true.
a. 17 students had scores of 10.
b. 42 students had scores of 13.
15
1
16
1
17
10
c. A and B are both true.
18
d. A, B and C are all false.
19
13
6. Find the mean ACT score (answers may be rounded).
20
9.
21
a. 21
b. 23
с. 22
d. 24
22
23
13
7. Find the median ACT Score 30 1 (answers may be rounded).
24
4.
25
3.
a. 21
b. 23
с. 22
d. 24
26
28
8. Find the mode.
29
30
1
a. 19
b. 23
c. 13
d. The mode is not unique.
9.
Find the median of the data: 5, 7, 4, 9, 5, 4, 4, 3
a. 5.125
b. 14
c. 4.5
d. 4
World
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