Question

The standard normal curve shown below is a probability density curve for a continuous random variable. This means that the area underneath the entire curve is 1. What is the area of the shaded region between the two z-scores indicated in the diagram?

Answer 1

P(1.25<z<.80)

Answer 2

forgot a negative ...

Answer 3

P(-1.25<z<.80)

you can either play with tables, or try the wolf
http://www.wolframalpha.com/input/?i=P%28-1.25%3Cz%3C.80%29

or if a ti83 use: normalcdf(low,high)