Given X- B n-p If E X -6-var X -4-2 then what is the number of trials-

The correct option is D 20 Given mean =np=6 and Variance =npq=4.2 ⇒ q=0.7, p=0.3 ∴ n(0.3) = 6 ⇒ n=20 ...

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Probability Distribution

Given X∼ B ...

Question

Given $X \sim B (n, p)$
If $E (X) = 6, v a r (X) = 4.2$ then what is the number of trials?

21

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10

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20

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7

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