Gcse Grade C Exam Practice Worksheet With Answer Key - Alperton Community School Page 15
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28Statistics: Mean, Median, Mode & Range
* 1.
Rosie had 10 boxes of drawing pins. She counted the number of drawing pins in each box.
The table
gives information about her results.
Number of
Frequency
drawing pins
29
2
30
5
31
2
32
1
(a)
Write down the modal number of drawing pins in a box..................................(1)
(b)
Work out the range of the number of drawing pins in a box..................................(1)
(c)
Work out the mean number of drawing pins in a box.............................(3) (Total 5 marks)
*3.
Charles found out the length of reign of each of 41 kings. He used the information to complete
the frequency table.
Length of reign
Number of kings
(L years)
0 < L ≤ 10
14
10 < L ≤ 20
13
20 < L ≤ 30
8
30 < L ≤ 40
4
40 < L ≤ 50
2
(a)
Write down the class interval that contains the median.….…………………….(2)
(b)
Calculate an estimate for the mean length of reign. …………………. Years (4) (Total 6
marks)
*11. Bill recorded the times, in minutes, taken to complete his last 40 homeworks. This table shows
information about the times.
Time (t minutes)
Frequency
20 ≤ t < 25
8
25 ≤ t < 30
3
30 ≤ t < 35
7
35 ≤ t < 40
7
40 ≤ t < 45
15
(a)
Find the class interval in which the median lies.....................................(1)
(b)Estimate of the mean time it took Bill to complete each homework...............minutes(4)
Alperton Community School Maths Department: GCSE Grade C Exam Practice
15
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