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According to a survey, a high school girls average 100 text messages daily (The Boston Globe,...

According to a survey, a high school girls average 100 text messages daily (The Boston Globe, April 21, 2010). Assume the population standard deviation is 20 text messages. Suppose a random sample of 50 high school girls is taken. What is the mean daily text messages of a sample of 50 high school girls?

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