Mathematics, 10.07.2019 08:30, gabrielolivas59
In a random sample of eight 8-to-12-year-old children, the sample mean time playing video games was 48.8 hours per month with sample standard deviation 3.5 hours. in a random sample of ten 13-to-18-year-olds, the sample mean time playing video games was 54.3 hours per month with sample standard deviation 5.3 hours. assume that the two populations are normally distributed.
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At a sand and gravel plant, sand is falling off a conveyor and onto a conical pile at a rate of 16 cubic feet per minute. the diameter of the base of the cone is approximately three times the altitude. at what rate is the height of the pile changing when the pile is 12 feet high? (hint: the formula for the volume of a cone is v = 1 3 Οr2h.)
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In a random sample of eight 8-to-12-year-old children, the sample mean time playing video games was...
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