Question 1047922
one  standard deviation from the mean accounts for about 68% of the set 
two standard deviations from the mean account for about 95%
and three standard deviations from the mean account for about 99.7%.
What can a person expect in what range will the price be 68% of the time
400 - 6.50 to  400 + 6.50
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What can a person expect in what range will the price be 95% of the time
400 - 13.00 to 400 +13.00