Question

The table below shows the days in a month sorted according to the amount of rainfall in a locality

Rainfall(mm)	Days
54	3
56	5
58	6
55	3
50	2
47	4
44	5
41	2

What is the average rainfall per day during this month?

Answer 1

Rainfall(mm)	Days	Total
54	3	54 × 3 = 162
56	5	56 × 5 = 280
58	6	58 × 6 = 348
55	3	55 × 3 = 165
50	2	50 × 2 = 100
47	4	47 × 4 = 188
44	5	44 × 5 = 220
41	2	41 × 2 = 82
Total	30	1545

The average of the rain fall per day during that month = \(\frac{Total\,rain\,fall}{Number\,of\,days}\)

= \(\frac{1545}{30}\) = 51.5mm