SOLUTION: Students at Lake Mean PE class ran a 5K with a mean run time of 31 minutes and a standard deviation of 4 minutes.
Approximately __ % finished between 23 and 27 minutes.
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-> SOLUTION: Students at Lake Mean PE class ran a 5K with a mean run time of 31 minutes and a standard deviation of 4 minutes.
Approximately __ % finished between 23 and 27 minutes.
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Question 1162146: Students at Lake Mean PE class ran a 5K with a mean run time of 31 minutes and a standard deviation of 4 minutes.
Approximately __ % finished between 23 and 27 minutes. Answer by Boreal(15235) (Show Source):
You can put this solution on YOUR website! This is between 1 and 2 sd s to the left of the mean.
empirically, it is half of the difference between 95 and 68, or about 13.5%
it is 0.1359 or 13.6%
z=(x-mean)/sd
