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Patty's pastries has 400 employees. It has been estimated that the probability of a worker gaining 6 pounds per year is .2. Use the normal approximation to the binomial random variable to find the probability that at least 90 of her workers will gain 6 pounds this year.

I don't know how to begin this problem... n=400, p=.2, q=1-.2=.8, p (x=90)?

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