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January 26, 2015

January 26, 2015

Posted by **tara** on Saturday, May 12, 2012 at 10:00pm.

a. what percentage of washing machines have replacement times less than 7 years?

b. find the probability that a washing machine will have a replacement time of more than 6.5 years?

- statistics -
**PsyDAG**, Sunday, May 13, 2012 at 12:21pmZ = (score-mean)/SD

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

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