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Question
If X ~ B`(20, 1/10)`, then E(X) = ______
Options
2
5
4
3
Solution
If X ~ B`(20, 1/10)`, then E(X) = 2.
Explanation:
X ~ B`(20, 1/10)` .....(Given)
∴ n = 20, p = `1/10`
E(X) = np
= `20 xx 1/10`
= 2.
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