Posted by **Lori** on Saturday, April 17, 2010 at 11:18pm.

The total amount being spent on personal calls in a month by employees of a company follows a normal distribution with a mean of $900 and a standard deviation of $50. Find the probability that in a randomly selected month the amount spent on personal calls is less than $750

- Math -
**MathMate**, Sunday, April 18, 2010 at 7:48am
The standard deviation, σ, is $50. The mean is $900.

To spend less than $750 means that the spending is less than mean - 3σ.

The probability of this happening, assuming the spending follows the normal distribution curve, can be found from the normal distribution tables, for example:

http://www.math.unb.ca/~knight/utility/NormTble.htm

where the probability for the tail end of 3σ is 0.001350, or 0.135%.

## Answer This Question

## Related Questions

- PROBABILITY - The total amount being spent on personal calls in a month by ...
- Satistics - Monthly incomes of employees at a particular company have a mean of...
- Statistics - A telephone company receives 3 calls every minute on an average. If...
- MATH - Which of the following normal distributions has the smallest spread? A. A...
- Math-Value of Mean - A brewery has a beer dispensing machine that dispenses beer...
- Statistics - The probability distribution of number of calls coming to a call ...
- Statistics - Information from the American Institute of Insurance indicates the...
- MATH - Find the z-score related to the raw score, mean, and standard deviation ...
- statistic - The mean salary per day of all the 5000 employees who work in a ...
- Statistics - The distribution of weekly salaries at a large company is reverse J...

More Related Questions