document.write( "Question 481882: Suppose we have a set of blood pressures with a mean of 120 Systolic, and a sample standard deviation of 12 points. If we assume a normal distribution of Systolic blood pressures, then between what two values can we be assured 99.7% of all Systolic blood pressures will lie? Please show all work
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Algebra.Com's Answer #329920 by ewatrrr(24785) $\"\"$ $\"About$

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document.write( "Hi,
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document.write( "for a normal distribution, three standard deviations from the mean 
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document.write( "accounts for 99.7% of the distribution.
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document.write( " 120 + 3*12 = 156
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document.write( " 120 = 3*12 = 84
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document.write( "Between 84 and 156 accounts for 99.7% of all the  Systolic blood pressures 
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