Question

Let Z be the standard normal variable with μ = 26 and σ = 3.2. Find the value of P(24 < X < 34).

Answer 1

You can play around with Z table stuff at
davidmlane.com/hyperstat/z_table.html

Answer 2

When I subtract 24-26 and divide it by 3.2 I get -0.625 which is not on the table.

Answer 3

you evidently do not know how to use the Z table. In the first place, you would subtract 24 from 26. But that is no use, since 2/σ just tells you how many σ you are from the mean.

This web site allows you to enter values for μ and σ and then specify the area (probability) between 24 and 34.

Now go back there and start playing around.

Answer 4

I did exactly as my instructor taught. The link to the website you sent did not work. Thanks for your time.

Answer 5

you need to find P(X<34) and P(X<24)
Then subtract to find P(24<X<34)

The link does work. I use it all the time. do a google for Z table calculator if you need to.

Answer 6

Believe me that site works :)