Page 13 - The Content_Neat

The mean

1 Calculate the mean for each set of data, giving your answer correct to one decimal place.

a 17, 24, 18, 32, 16, 28, 20 b 92, 101, 98, 102, 95, 104, 99, 96, 103

3 The monthly wages of 11 full-time staff who work in a restaurant are as follows:

$820, $520, $860, $2000, $800, $1600, $760, $810, $620, $570, $650

a Find their median wage. b Calculate their mean wage.

c How many of the staff earn more than:
i the median wage ii the mean wage?

4 Town Team scored 315 runs in nine games of cricket.

What is the smallest number of runs they need to score in their next match to get a higher average
(mean) score?

5 The numbers of runs that a cricketer scored in seven innings were:
48, 32, 0, 62, 11, 21, 43

a Calculate the mean number of runs in the seven innings.
b After eight innings his mean score increased to 33 runs per innings. How many runs did he
score in his eighth innings?

6 The mean age of a group of 8 walkers is 42. Joanne joins the group and the mean age changes
to 40. How old is Joanne??

7 A class of 18 boys and 12 girls sit for a Science exam.
The mean mark for the boys is 62.5 %

The mean mark for the girls is 58.75 %
Work out the mean mark for the whole class.

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