Homework Help: statistics

Posted by mike on Saturday, March 17, 2012 at 7:15pm.

The mean life of a set of batteries in a T83 calculator is 525 with a standard deviation of 35 hours assume normal distribution is normal whats is the probability that set will last for more the 540 hrs

statistics - PsyDAG, Monday, March 19, 2012 at 4:03am
Z = (score-mean)/SD

Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion related to the Z score.

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