If x is a binomial random variable with n = 20, and p = 0.30, then p(x = 10) = 0.50.

1 answer:

meriva2 years ago

7 0

In the binomial expansion of (0.30+0.70)²⁰ the coefficient is ²⁰C₁₀=184756 for x=10 and we have 0.30¹⁰×0.70¹⁰ for the pq values where q=1-p. This comes to about 0.03. So the statement p(x=10)=0.50 is false, answer b.

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