Homework Help: statistics

Posted by Robbie on Friday, November 9, 2012 at 7:35pm.

A normal distribution has a mean of 36 and standard deviation of 4. What proportion of the
distribution consisted of scores between x=34 and x=38?
a, 0.6915
b, 2(0.3085)=0.6170
c, 0.1915
d, 2(0.1915)=0.3930

statistics - PsyDAG, Friday, November 9, 2012 at 10:25pm
Z = (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.

Answer this Question

Related Questions

MATH - Which of the following normal distributions has the smallest spread? A. A...
Math (Statistic) - Considered the sampling distribution of a sample mean ...
statistics - An SRS of size n is taken from a large population whose ...
Math - I have a problem on standard deviation, and I will need some help with it...
statistics - A normal distribution has a mean of 20 and a standard deviation of ...
stats - the distribution of IQscores forms a normal distribution with a mean of ...
statistics - For a normal distribution with a mean of 140 and a standard ...
statistics - The scores of students on the ACT college entrance examination in ...
business statistics - The sampling distribution of x bar must be a normal ...
Statistics - In a given normal distribution, the standard deviation is 14.4 and ...

For Further Reading

First Name:
School Subject:
Answer: