Questions

Assume a standard normal distribution.

1. Find the probability that z is between -2.3 and 1.6.

2. Find the probability that z is less than -0.57.

3. Find the probability that z is more than 1.25.

4. Find the probability that z is more than 2.5.

5. Find the probability that z is more than -1.6.

6. Find P(-3<z<3).

7. Find P(-2.5<z<1).

8. Find P(-2.2<z<-.5).

9. Find the z value corresponding to the 80th percentile.

10. Find the z value corresponding to the 25th percentile.

11. Find the z value corresponding to the median.

12. If you are finding P(a<z<b), what is true about the numbers a and b if you must do an addition to get the answer? what is ture about the numbers a and b if you must do a subtraction to get the answer?

13. How do you find P(z>a) where a is some number? What do you do when a is positive?, zero?,negative?

14. How do you find P(z<a) where a is some number? What do you do when a is positive?, zero?,negative?