The average middle-distance runner at a local high school runs the mile in 4.5 minutes, with a standard deviation of 0.3 minute. The percentage of a runners that will run the mile in less than 4 minutes is ________%.

Question

anonymous · Answer

I got 16%

anonymous · Answer

mean±s.d
 we have to see where our runner lies in terms of the mean and the deviation,
the runners that run less than 4 min are within two s.d from the mean
4,5±2∗0,3

between 4,5-0,6=3,9 and 4,5+0,6=5,1
and these is approaximately 95%

anonymous · Answer

Thanks :)

anonymous · Answer

No problem! Thanks for the medal! Bye! ;)