Homework Help: statistics

Posted by Aditi on Friday, June 24, 2011 at 1:58am.

mean = 60 wpm
standard deviation= 15 wpm

a.What is the probability that a randomly selected typist's net rate is at most 60 wpm? less than 60 wpm?

b. What is the probability that a randomly selected is between 45 and 90 wpm?

statistics - PsyDAG, Friday, June 24, 2011 at 11:49am
Z = (score-mean)/SD

Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportions/probabilities related to the Z scores.

Answer this Question

Related Questions

Statistics - Suppose that the birth weight of newborn babies in the U.S is ...
statistics - A bank’s loan officer rates applicants for credit. The ratings...
Statistics - assume that adults have IQ scores that are normally distributed ...
Statistics - 9. Assume the weight, W, of a randomly selected adult has a normal...
Statistics - The average age of chemical engineers is 37 years with a standard ...
statistics - A final exam in sociology has a mean of 72 and a standard deviation...
statistics - A final exam in Math 157 is normally distributed and has a mean of ...
statistics - 1.On a test the mean is 75 and the standard deviation is 5. A. What...
statistics - Based on data from the National Health and Nutrition Examination ...
statistics - Scores on the ACT test are normally distributed with a mean of 21.1...

For Further Reading

First Name:
School Subject:
Answer: