Determine the mean and variance
In the survey, 55% of the voters support a specific referendum. If 40 voters are selected at random, and X is the number of voters that support this referendum, determine the mean and variance of X.
Find the variance.
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After biking at the rate of 14 mph for a while, bike breaks down and he rides back with the father at the rate of thirty-five mph. How far boy rode the bicycle if he returns one hour after he left?
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Both are released and accelerated toward each other. How fast is every particle moving when separation between them is one-third its original value?
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