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Question: why sigma multiples by 2 please solv it very clear...

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The systolic blood pressure of 18-year-old women is normally distributed with a mean of 120 mmlHg and a standard deviation of 12 mmHg. Using the empirical rule, 95 percent of 18-year-old women will have a systolic blood pressure between what two numbers (in mmHg)?

why (sigma) multiples by 2?
please solv it very clear, with description for each step

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