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Recent research indicated that about 25​% of children in a certain country are deficient in vitamin...

Recent research indicated that about 25​% of children in a certain country are deficient in vitamin D. A company that sells vitamin D supplements tests 320 elementary school children in one area of the country. Use a Normal approximation to find the probability that no more than 67 of them have vitamin D deficiency.

The probability is approximately what?

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