Statistics Worksheets With Answers - Newbattle High School Page 31
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454.
The pupils in Castle High School’s top maths class looked out of their classroom
window and noticed that the grass had not been cut for a long time.
Their teacher, Mrs. McKenneth, estimated that the grass was about 15 cm high, but the
pupils wanted to give their estimates.
A table of results was drawn up.
Height (cm)
Frequency
Height x Frequency
13
2
14
4
15
2
16
2
17
10
18
1
(a) Copy and complete the table and say how many pupils took part.
(b) What was the range?
(c) Calculate:
(i)
the mean
(ii)
the median
(iii)
the mode.
(d) What do you think of Mrs. McKenneth’s estimate?
5.
Quix’s Chocolate Company claim that there are 20 mini-quix bars in an economy
pack. Some economy packs were purchased and the contents were as follows:-
No. Bars
Frequency
Number x Frequency
18
2
19
9
20
8
21
5
22
5
23
5
Total
(a) Copy and complete the table.
(b) What was the range in the number of bars?
(c) Calculate: (i) the mean
(ii) the median
(iii) the mode.
(d) Which average did the company use to back their claim?
31
Mathematics: Mathematics 2 (Int 1) Statistics – Student Materials
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