For Tommy Bench, a minor league pitcher, the times between pitches are normally distributed with a mean of 36 seconds and a standard deviation of 2.5 seconds. If Bench performs 50 pitches, how many of them (to the nearest whole number) do you expect to have times-between-pitches to be longer than 40 seconds?

Question

For Tommy Bench, a minor league pitcher, the times between pitches are normally distributed with a mean of 36 seconds and a standard deviation of 2.5 seconds.  If Bench performs 50 pitches, how many of them (to the nearest whole number) do you expect to have times-between-pitches to be longer than 40 seconds?

bobpursley · Answer

http://davidmlane.com/hyperstat/z_table.html