Question

The following table gives the monthly expenditure on a motor car for a period of two years.
Year
January February March April May June
1961 £ 18.2 7.4
9.4
10.6 11.3
9.2
1962 £ 11.5 11.0
6.9
14.1 9.0
8.3
Year July August September October November December
1961 £9.8 10.6
8.2
7.7 19.2
8.7
1962 £ 13.9 7.9
7.5
16.5 8.2
10.7
Calculate 12-monthly moving averages for the two years and display them and the original table in the same graph.

Answer 1

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