Standard error of the mean
The standard deviation of a normal random variable is 20. If a sample of 225 is selected out of a large population, what is the standard error of the mean? Round to 3 decimal places.
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Nobel laureate Richard Feynman (1918-1988) once said that if two persons stood at arm's length from each other and each person had 1% more electrons than protons, the force of repulsion between them would be enough to lift a "weight" equal to tha
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The weight of food packed in certain containers is a random variable with a mean of 16 oz. and a standard deviation of .6 oz. If 36 packages are randomly selected, find the probability that the mean will be greater than 16.2 oz.
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The amount of time (in minutes) devuted to commercials on a TV channel during any half-hour program is a random variable whose mean is 6.6 minutes and whose standard deviation is .866 minutes. If 40 half-hour blocks were randomly selected, find th
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