Data Management Review Questions

1.  The following table gives the percent distribution of electricity production in Canada by hydro, steam, and nuclear.

Electricity Production

Year / Hydro / Steam / Nuclear
1970 / 76.5 / 22.1 / 0.5
1795 / 74.0 / 20.8 / 4.3
1980 / 68.4 / 21.4 / 9.8
1985 / 67.4 / 19.1 / 12.8
1990 / 62.9 / 21.5 / 14.8

a.  Display the data on a triple broken-line graph.

b.  Calculate the mean production of electricity for each.

c.  Predict what might the year 2000 have looked like for all three on your graph.

2.  The table shows the average length and height of five mammals found in Canada.

Mammal / Length (m) / Height (m)
Grizzly Bear / 2.6 / 2.8
Polar Bear / 2.6 / 1.4
Lynx / 0.9 / 0.6
Moose / 2.8 / 1.7
Arctic Wolf / 1.5 / 1.0

a.  Display these data on a double bar graph.

b.  Calculate the mean, median and mode for both height and length for this data set.

3.  The student marks for two math tests are shown.

1st test : 64, 72, 85, 76, 88, 67, 78, 59, 71, 73, 94, 92, 83, 79

2nd test : 66, 75, 88, 74, 92, 74, 82, 61, 67, 78, 92, 95, 86, 77

a.  Display your data on a back-to-back step-and-leaf plot.

b.  How many students wrote each test?

c.  What is the mean, median and mode of each test?

d.  What is the mean, median and mode for all the test results?

4.  The table shows the average monthly precipitation in Moncotn, New Brunswick, from January to June.

Month / Precipitation (mL)
January / 125
February / 99
March / 112
April / 90
May / 84
June / 90

a.  Display the data on a pictograph, using an appropriate symbol.

b.  Calculate the mean of the data.

c.  Why do you think the month of January is so high?

5. A survey asked 450 grade 8 students which of the following activities they took part in last summer. The table gives the results of the survey.

Summer Activities
Activity / Percent
Swimming Lessons / 44%
Camp / 28%
Summer Job / 25%
Summer School / 23%
Family Trip / 58%

a.  How many students took part in each activity?

b.  Why does the percent column total more than 100%?

c.  Predict the number of students at Thomas Street that might have participated in each activity. (Thomas Street = 965 students)