Name: _________________
Grade 7 Study Guide – Chapter 3
Math Test Thursday November 8th, 3 questions/20 marks
1.
A class of 24 students were measured and they recorded the following heights in centimeters:
(6 MARKS)
170
162
163
145
152
148
149
165
129
161
170
149
158
156
148
165
155
154
149
151
137
145
139
144
a) What intervals should they use to record this data in a stem and leaf plot?
b) Record the heights in a frequency table.
c) Which interval had the greatest frequency?
2.
The class above got the following test scores (%) (7 MARKS)
99
56
54
89
87
82
65
65
99
75
78
76
71
64
72
54
82
81
89
62
54
78
99
80
a) Calculate the median, mean, and mode for these test scores.
b) The teacher says the average is 99%, which measure of central tendency did she choose? Why is her
choice misleading?
c) Which measure of central tendency (median, mean, and mode) best describes the average mark? Explain.
3.
Becky has kept a record of her weekly test scores all term (%)(7 MARKS)
50
65
85
75
78
95
65
92
75
71
66
77
82
71
66
84
63
74
71
76
86
89
58
87
98
94
a) Organize these scores into a stem-and-leaf plot.
b) Calculate the mean, median and mode of Becky’s test scores. Which measure is the most
appropriate representation? Explain.