Question
Asked Oct 21, 2019
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Running times for 400400 meters are Normally distributed for young men between 1818 and 3030 years of age, with a mean of 9393seconds and a standard deviation of 1616 seconds. Thus, 99.799.7 % of running times are approximately between:

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Expert Answer

Step 1

From the given information, the random variable X as the running times follows normal distribution with mean 93 seconds and the standard deviation is 16 seconds.

 

Empirical Rule for normal distribution:

 

  • The percentage of values lies between one standard...
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Image Transcriptionclose

-30,+3093-(3x16),93+ (3x16)] =[93- 48,93+48] -[45,141]

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