Homework Help: math

Posted by Rmz on Wednesday, January 27, 2010 at 8:46pm.

A physical fitness association is including the mile run in its secondary-school fitness test. The time for this event for boys in secondary school is known to posses a normal distribution with a mean of 450 seconds and a standard deviation of 50 seconds. Find the probability that a randomly selected boy in secondary-school can run the mile in less than 335 seconds.

I do not even know what this is asking...can anyone help??

math - PsyDAG, Thursday, January 28, 2010 at 11:21am
Z = (x - mean)/SD

Solve for Z and look up Z in table in your stats book called something like "areas under the normal distribution" for the smaller portion.

I hope this helps.
math - Anonymous, Sunday, November 7, 2010 at 10:33pm
7

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