Wednesday

July 30, 2014

July 30, 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.

**Related Questions**

Statistics - If a completion time for a task is normally distributed with a mean...

statistics - The MacBurger restaurant chain claims that the waiting time of ...

statistics - The reaction time of subjects to a certain psychological experiment...

statistics - The reaction time of subjects to a certain psychological experiment...

statistics - The times taken to complete a statistics test by all students are ...

statistics - The times taken to complete a statistics test by all students are ...

statistics - IQ scores are normally distributed with a mean of 105 and a ...

Statistics - Given that x is a normally distributed random variable with a mean ...

statistics - The length of country and western songs is normally distributed and...

statistics - The time it takes to give a man a shampoo and haircut is normally ...