Posted by **alex** on Sunday, June 20, 2010 at 1:27pm.

The heights of 18-year-old men are approximately normally distributed with mean 68 inches and standard deviation 3 inches. What is the probability that the average height of a sample of ten 18-year-old men will be less than 70 inches? Round your answer to four decimal places.

0.0174

0.4826

0.9652

0.9826

0.4913

- Statistics -
**PsyDAG**, Monday, June 21, 2010 at 12:27pm
Are you looking for the average or the individual score? This would be for the latter. For the former, you need to have the sample size to find the SE (see following post).

Z = (score - mean)/SD

Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion related to that Z score.

- Statistics -
**PsyDAG**, Monday, June 21, 2010 at 12:29pm
Sorry, it was not your post. Here it is.

98% interval = mean ± SE

SE (Standard error) = SD/√(n-1)

Z = (score - mean)/SE

## Answer this Question

## Related Questions

- Statistics - The heights of 18 year old men are approximately normally ...
- statistics - The height of 18-year-old men are approximately normally ...
- Statistics - A simple random sample of 50 female 14-year-olds is selected. The ...
- Statistics - The Boeing 757-200 ER airliner carries 200 passengers and has doors...
- statistics - It is well known that the heights of individual American men are ...
- stat - assume that the heights of men are normally distributed with a mean of 68...
- Statistics - In a murder trial in Los Angeles, a shoe expert stated that the ...
- statistics - The heights of South African men are normally distributed with a ...
- Stats - The heights of men in the USA are normally distributed with a mean of 68...
- Statistics - the heights of young women are approximately Normal with 65 inches ...

More Related Questions