The weight of children in the u.s. are normally distributed, Ask an Expert

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The weight of children in the U.S. are normally distributed with a mean of 8.0 pounds and standard deviation of 1 pound. A random sample of 100 children results in a sample mean of 7.7 pounds. What is the probability of a single randomly selected child having a weight that is less than or equal to 7.7 pounds?

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