Question 1. Cities must find better ways to dispose of solid waste. According to the Environmental Protection Agency, the composition of the 217 million tons of solid municipal waste created in 1997 was:

Paper and paperboard

38.5%

Yard waste

12.3%

Food waste

10.6%

Plastics

9.2%

Metals

7.4%

Other materials

Determine the percentage of other materials in the solid waste. This category includes glass, wood, rubber, and so on.

24.0%
22.0%
19.0%
18.0%

Question 2. Data from one campus dorm on the number of burglaries are collected each week of the semester. These data are to be grouped into the classes 0-3, 4-7, 7-11, 12-15, 16 or more. Both endpoints included. Explain where a difficulty might arise.
Difficulty may arise while putting the data into the class:

7-11
0-3
16 or more
12-15

Question 3. A sample of 50 departing airline passengers at the main check-in counter produced the following number of bags checked through to final destinations.

1 1 2 2 1 2 1 2 3 0 1 0
1 1 0 1 3 0 1 2 1 1 1 2
1 2 2 1 2 0 0 2 2 1 1 1
1 1 1 1 2 0 1 3 0 1 2 1
1 3

What proportion of passengers who check in at the main counter fail to check any bags?

.14
.18
0.16
.20

Question 4. The city of Madison regularly checks the water quality at swimming beaches located on area lakes. The concentration of fecal coliforms, in number of colony forming units (CFU) per 100 ml of water, was measured each day for fifteen days during the summer at one beach.

With reference to the given data, find the sample 90th percentile.

525
631
532
498

Question 5. On opening day one season, 10 major league baseball games were played and they lasted the following numbers of minutes.
167 211 187 176 170 169 198 218 145 232
Find the sample variance. Round your answer to two decimal places.

768.23
728.12
727.12
731.12

Question 6. The following summary statistics were obtained from a data set.
= 77.0, s = 7.1
Approximately what proportion of the observations is in the interval 55.7 to 98.3?

0.997
0.5
0.95
0.35

Question 7. Calculate the mean for the following data set. Round your answer to first decimal digit.
7 28 3 18 13 32

14.5
16.2
16.8
17.2

Question 8. 8. Calculate the median for the following data set. Round your answer to first decimal digit.
7 28 3 18 13 32

16.8
13.6
15.5
17.4

Question 9. The city of Madison regularly checks the water quality at swimming beaches located on area lakes. The concentration of fecal coliforms, in number of colony forming units (CFU) per 100 ml of water, was measured each day for fifteen days during the summer at one beach.

With reference to the given data:
Find the first quartile

180
19
60
20

Question 10. The city of Madison regularly checks the water quality at swimming beaches located on area lakes. The concentration of fecal coliforms, in number of colony forming units (CFU) per 100 ml of water, was measured each day for fifteen days during the summer at one beach.

With reference to the given data:
Find the third quartile.

340
110
260
725