The mean of 20, 30, 40, 20 ___, 10 is 25. Find the missing number.

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Solution

The correct option is B 30
The sum of the given numbers = 20 + 30 + 40 + 20 + 10
= 120

Including the missing one, here the number of values is 6.

Mean = $\frac{S u m o f o b s e r v a t i o n s}{N u m b e r o f o b s e r v a t i o n}$

The mean is 25 so the sum of all the values is $6 \times 25 = 150$

Missing Number = 150 - 120
= 30

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