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Can I have help with this? The weight of envelopes sent from an insurance office are normally distributed with population mean M = 12 ounces

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The weight of envelopes sent from an insurance office are normally distributed with population mean M = 12 ounces and population standard deviation . =3.7 ounces. What is the probability that a random sample of 20 envelopes has a mean weight x lying between 10 ounces and 13 ounces

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