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September 22, 2014

September 22, 2014

Posted by **victor** on Saturday, November 5, 2011 at 7:23pm.

I) What is the probability that a customer selected at random takes less than 13 seconds?

II) Find the proportion of customers that take :

a) Between 15 and 21 seconds to use the cash dispensers?

b) Between 12 and 24 seconds to use the cash dispensers?

- statistics -
**PsyDAG**, Sunday, November 6, 2011 at 12:18pmZ = (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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