Question

If X ∼ B`(20, 1/10)` then E(X) = ______.

Options

• 2

• 5

• 4

• 3

Answer 1

If X ∼ B`(20, 1/10)` then E(X) = 2.

Explanation:

Given,

X ∼ B `(20, 1/10)`

∴ Here, n = 20 and p = `(1)/(10)`

∴ E(x) = np = `20 xx (1)/(10)` = 2.