Jill and Jack both live in a university. Jill receives an electricity bill of $45. Jack receives an electricity bill of

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answerhappygod
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Jill and Jack both live in a university. Jill receives an electricity bill of $45. Jack receives an electricity bill of

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Jill and Jack both live in a university. Jill receives an
electricity bill of $45. Jack receives an electricity bill of $37.
The mean electricity bill of all the university student is
$30. The variance of the electricity cost among the bills is 400.
What percentage of students receives an electricity bill between
the bills of Jill and jack?
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