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I'm having a lot of trouble with this question: Estimate the probability that in 1000 flips of a fair coin, there are at least 540

I'm having a lot of trouble with this question:

Estimate the probability that in 1000 flips of a fair coin, there are at least 540 heads. (normal approx. to the binomial distribution).

I know how to solve for exactly 540 heads, but not sure what to do since it said "at least"

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