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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

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 310 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 . (Round to three decimal places as needed.)

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