Mathematics, 15.04.2020 22:13 amp92904

According to national data on the sleeping habits of adults, the amount of sleep per night of all U. S. adults follows a normal distribution with a mean of 7.5 hours and a standard deviation of 1.2 hours. A study surveyed a random sample of 700 U. S. adults and found that their average amount of sleep per night was 6.85 hours with a standard deviation of 1.88 hours.

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According to national data on the sleeping habits of adults, the amount of sleep per night of all U....