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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 -

    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.

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