Normal distribution/Standard deviation

JordanWood

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Over 10,000 runners competed in a large urban marathon. The times of the runners follow a normal distribution. Using the information given below, determine the means and the standard deviation for the runners' times. Give your answers in hours, minutes, and seconds.
* Only 16% of the runners were able to finish in less than 3 hr 43 min 31 sec.
* 97.5% of the runners needed at least 2 hr 54 min 54 sec to complete the marathon.





mean:___________________ Standard Deviation:___________________

I am unsure how to do this problem and need as much help as possible. Please and thank you.
 
Over 10,000 runners competed in a large urban marathon. The times of the runners follow a normal distribution. Using the information given below, determine the means and the standard deviation for the runners' times. Give your answers in hours, minutes, and seconds.
* Only 16% of the runners were able to finish in less than 3 hr 43 min 31 sec.
* 97.5% of the runners needed at least 2 hr 54 min 54 sec to complete the marathon.

I am unsure how to do this problem and need as much help as possible. Please and thank you.
What have you covered in your class, specifically about normal distributions and such things as the percentages related to deviations?

When you reply, please include a clear listing of your thoughts and efforts so far, so we can see where you're needing help. Thank you! ;)
 
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