Gcse Grade C Exam Practice Worksheet With Answer Key - Alperton Community School Page 16
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2813.
Janine recorded the times, in seconds, for each of 15 people to do a puzzle. Here are her results.
90
81
78
83
68
75
79
81
69
87
76
91
67
73
81
(a)
Complete the ordered stem and leaf diagram and key to show these results.
(3)
Janine says “To find the median time, you add all the results and divide by 15” Janine is wrong.
(b)
(i)
Explain how to find the median.
...............................................................................................................................
(ii)
Find the median....................................... s (2) (Total 5 marks)
(b)
Work out the range of the number of e-mails Mark received in the 21 days.............................(1)
Total 2 marks)
*28. Vanessa made 80 phone calls last month.
The table gives information about the length of the calls.
Length of call
Frequency
(t minutes)
0 < t ≤ 10
20
10 < t ≤ 20
32
20 < t ≤ 30
14
30 < t ≤ 40
9
40 < t ≤ 50
5
Work out an estimate for the mean length of the calls.
................... minutes (Total 4 marks)
Alperton Community School Maths Department: GCSE Grade C Exam Practice
16
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