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

According to a bank, the time taken by its customers to use cash dispensing machines is normally distributed with a mean of 18 seconds and a standard deviation of 3 seconds.

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?

## Answer This Question

## Related Questions

- Statistics - If a completion time for a task is normally distributed with a mean...
- Statistics - ATM transaction times are normally distributed with a mean of 150 ...
- statistics - The reaction time of subjects to a certain psychological experiment...
- statistics - The reaction time of subjects to a certain psychological experiment...
- statistics - The length of country and western songs is normally distributed and...
- algebra 2 - "for 2000 patients, blood-clotting time was normally distributed ...
- maths(Please help me out) - A survey of mobile call interconnectivity indicates ...
- statistics - If a data set has a mean of 10.0 seconds and a standard deviation ...
- statistics - if a data se has a mean of 10.0 seconds & a standard deviation of 2...
- fnu - The length of country and western songs is normally distributed and has a ...

More Related Questions