Question

The rainfall (in mm) in a city for a week was recorded as 1.4, 12.1, 2.2, 0, 21.5 , 4.5 , 1.0 . The mean rainfall is *​

Answer 1

Answer:

mean = sum of all divided by total no

=0 + 1.4 + 12.1 + 2.2 + 21.5 + 4.5 + 1.0/7

= 42.7 / 7

= 6.1

Answer 2

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Given:

• Rainfalls recorded for a week in a city

To Find:

• Mean rainfall

Solution:

$Mean = \dfrac{Sum\;of\;all\;observations}{Total\;no.\;of\;observations} \\ \\ \implies Mean = \dfrac{1.4+12.1+2.2+0+21.5+4.5+1.0}{7} \\ \\ \implies Mean = \dfrac{42.7\!\!\!\!\!\!\bold{/}^{\:\:6.1}}{7\!\!\!\bold{/}_1} \\ \\ \bold{\implies Mean = 6.1mm\: rainfall}$

Formula Used:

• $Mean = \dfrac{Sum\;of\;all\;observations}{Total\;no.\;of\;observations}$

Hope it helps!!!