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Methods2024 Exam 1 · Q4Tech-free3 marks

Binomial standard deviation and probability

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Let $X$ be a binomial random variable where $X \sim \operatorname{Bi}\left(4, \frac{9}{10}\right)$ .

a.

Find the standard deviation of $X$ .

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b.

Find $\Pr(X < 2)$ .

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