Explore BrainMass

Normal Probability

For some reason, I have had such difficulty with this type. I do not simply want to know the answers, but I truly want to get how to figure this out before my final exam. Thank you so much for your help.

The mean starting salary for college graduates in the spring of 2000 was $31,280. Assume that the distribution of starting salaries follows the normal distribution with a standard deviation of $3,300. What percent of the graduates have starting salaries:

a) Between $30,000 and $35,000?
b) More than $40,000.

Solution Summary

The solution provides step by step method for the calculation of probability using the Z score. Formula for the calculation and Interpretations of the results are also included.