They are multiple choice questions.

1. If a raw score of 80 equals a z score of 2.00 in a distribution of scores with M=50, then the variance must equal?

A. 30

B. 60

C. 160

D. 225

2. If Test X has a mean of 50, standard deviation of 10 (assuming a normal distribution), and N=1000. How many individuals score between 40 and 60?

A. 340

B. 680

C. 990

D. More information is needed

Any help is appreciated. I would really like to see your work on how you come up with the answer so I can try to learn how to do it myself.

Thanks!