Section S.4 – Solutions to the Practice Problems
1.
a. $2.00
b. $7.81
c. $0.64
2.
a. 14.2
b. 20.81 sec
c. 4.07 sec
3.
a. $338.40/credit hour
b. $316.04/credit hour
4.
a.
|
Enrollment |
Frequency |
|
0 – 5999 |
16 |
|
6000 – 11999 |
12 |
|
12000 – 17999 |
3 |
|
18000 – 23999 |
2 |
|
24000 – 29999 |
2 |
b.
c. 8628.7
d. 6943.9
5.
a.
|
Age |
Frequency |
|
21-24 |
6 |
|
25-28 |
3 |
|
29-32 |
4 |
|
33-36 |
8 |
|
37-40 |
4 |
|
|
n = 25 |
b.
c. 30.68 years
d. 6.09 years
6.
a. 1.48
b. 1.12
c. 0, 1 , 1, 2 , 4
d.
7.
a. 1, 3, 4, 5, 7
b.
8.
a. $87, $175, $218, $416, $1300
b.
c. $175 is the 25th percentile
d. $218 is the 50th percentile
9.
a. 236.3 lbs.
b. 37.9 lbs.
c. 174, 206, 241, 272, 302
d.
10.
a. 3, 4 , 4, 6 , 7
b.
c. The 50th percentile is 4
d. The 75th percentile is 6
11.
a. 30, 40, 75, 90, 99
b. 40, 75, 90, 94, 105
c. Kendra makes more money, $50 thousand more
12. 75%
13.
a. 7-series
b. 3-series
c. No, the age increases with each series and people tend to make more money as they get older.
14.
15.
a. 50
b. 25
c. 1178
d. 1767
16.
a. 15
b. 57
c. 836
d. 1292
17.
a. 25
b. 50
c. 50
d. 75
18.
a. Male Artists. All of the data items for men are greater than the greatest data item for the women.
b. Male Artists 93, Female Artists 58
c. Male Artists. There is a greater spread in the data for the men.
d. Male Artists 32.64, Female Artists 6.82
19. The Arnold Family, their standard deviation is higher, which means that their bills vary more.
20. Richard Mulligan, his standard deviation is lower, which means he is more consistent.
21.
a. 25
b. 8.72
c. 25, 27.5, 35, 40, 50
22.
a. 7
b. 2.20
c. 1, 2, 5, 6, 8
