A+ Answers

Given that z is a standard normal random variable, compute the following probabilities:

1. P(-1.98 <= z <= .49)

2. P(.52 <= z <= 1.22)

True or False

3. A + A' always equals zero.

4. If the variance equals zero, the values of z must add up to zero (ex. 1,-1,2,-2)

5. The normal distribution curve does not have to be symmetric to zero.