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According to a 2003 study published in Developmental Medicine and Child Neurology, the amount of time...

According to a 2003 study published in Developmental Medicine and Child Neurology, the amount of time per day normal children (ages 8-15 years old) spend in an upright position (i.e., not sitting or lying down) is normally distributed with a mean of 5.4 hours and a standard deviation of 1.3 hours.

What percent of children spend less than 3.5 hours upright per day?

If I collect a random sample of four children, what is the probability that exactly 1 of them will spend less than 3.5 hours per day upright?

If I collect a random sample of four children, what is the probability that their average time spent upright will be less than 3.5 hours per day?

Math   Statistics-And-Probability   
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