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

DayMonTueWedThursFriSatSun
Rainfall (in mm)0.012.22.10.020.55.51.0

(i) Find the range of the 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?

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(i)The range of the rainfall = Highest rainfall – Lowest rainfall = 20.5 – 0.0 = 20.5 mm

(ii) Main rainfall

(iii) 5 days. i.e., Monday, Wednesday, Thursday, Saturday and Sunday rainfalls were less than the mean rainfall. 

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