Hi, 

body temperatures with a mean of 98.6 degrees, 

and a sample standard deviation of 0.5 degrees

what two values should 99.7% of all temperatures lie? 

Within  SD of the mean:

 

     



For the normal distribution: 

one  standard deviation from the mean accounts for about 68.2% of the set 

two standard deviations from the mean account for about 95.4%

and three standard deviations from the mean account for about 99.7%.

 

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