Posted by **marie** on Friday, August 20, 2010 at 12:35am.

the random variable x is normally distributed with a mean of 75 and a standard deviation of 15.0. For this distribution, what is the twenty-third percentile?

- statistics -
**drwls**, Friday, August 20, 2010 at 7:32am
23% of the population is below x = 64, if that is what you mean.

See http://psych.colorado.edu/~mcclella/java/normal/accurateNormal.html

for how I got that.

- statistics -
**PsyDAG**, Friday, August 20, 2010 at 11:06am
Z = (score-mean)/SD

If you do not have a computer available, find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion to help you find the above Z score and then the specific score.

## Answer This Question

## Related Questions

- statistics - Let X be a continuous random variable that is normally distributed ...
- statistics - Women’s heights are normally distributed with a mean of 162 cm and ...
- Math - For a normally distributed distribution of variable x, where the mean is ...
- Math - Random variables X and Y are both normally distributed with mean 100 and ...
- Analytical Skills - If your score on a statistics exam was 76 and the professor ...
- statistics - The weight of a small Starbucks coffee is a random variable with a ...
- statistics - Section 5.3: Normal Distributions: Finding Values Answer the ...
- Statistics - An investment broker reports that yearly returns on common stocks ...
- Statistics - I am so lost on this statistics question would someone help me ...
- Statistics - Given that x is a normally distributed random variable with a mean ...

More Related Questions