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If the variance of x is 4 then the variance of 3 + 5x is_______

(a) 100

(b) 103 

(c) 20

(d) 23

1 Answer

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Best answer

The correct option(a) 100   

Explanation:

Let y = 3 + 5x

given: S2x = 4

∴ S2y = (5)2 ∙ S2x

∴ S2y = 25 × 4 = 100

∴ Variance of y = 100.

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