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Question -

The rainfall (in mm) in a city on 7 days of a certain week was recorded as follows:

Day

Mon

Tue

Wed

Thurs

Fri

Sat

Sun

Rainfall

(in mm)

0.0

12.2

2.1

0.0

20.5

5.5

1.0

(i) Find the range of rainfall in the above data.

(ii) Find the mean rainfall for the week.

(iii) On how many days was the rainfall less than the mean rainfall.



Answer -

(i) Range of rainfall = Highest rainfall тАУ Lowest rainfall
= 20.5 тАУ 0.0
= 20.5 mm
(ii) Mean of rainfall = Sum of all observations/ Number of observation
= (0.0 + 12.2 + 2.1 + 0.0 + 20.5 + 5.5 + 1.0)/ 7
= 41.3/7
= 5.9 mm
(iii) We may observe that for 5 days i.e. Monday, Wednesday, Thursday, Saturday and Sunday the rainfall was less than the average rainfall.

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