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Frequency Table & Its Average

Means of a se...

Question

Means of a set of 22 readings is 20, if each readings is multiplied by 4 and then 10 is added to it, the new mean is

A

90

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B

73

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C

85

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D

87

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Solution

The correct option is A $90$
New mean $¯ x = 20 \times 4 + 10 = 90$

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