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If a given distribution is known to be bell-shaped and symmetric, what percent of the observations...

If a given distribution is known to be bell-shaped and symmetric, what percent of the observations are expected to fall within two standard deviations of the mean?

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Answer #1

Solution:- If a distribution is bell shaped and symmetric with mean and standard deviation provided

, then according to emperical rule of probability,, 95% of observation will fall within two standard deviation of the mean. But if we want exact percentage then,,

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