Hi, 

Last year, the personal best high jumps of track athletes in a nearby state 

were normally distributed with a mean of 205 cm and a standard deviation ofcm.

P(205< X <231) = 

For the normal distribution: 

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

 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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