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Question: data are drawn from a bellshaped distribution with a mean...

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Data are drawn from a bell-shaped distribution with a mean of 100 and a standard deviation of 4.

a) Approximately why percentage of the observations fall between 92 and 108?
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b) Approximately what percentage of the observations fall between 88 and 112?
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c) Approximately what percentage of the observations are less than 96?
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I’m having a lot of trouble with these, please explain each problem and show work.
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