Question: how can is solve these step by step? Assume that x is a binomial random variable with n = 1000 and p = 0.4. Use

how can is solve these step by step?

Assume that x is a binomial random variable with n = 1000 and p = 0.4. Use a normal approximation to find each of the following probabilities. a. P(x > 400) b. P(390 s x 440)

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