2. What is the area between z-scores -0.79 and 1.23?

3. a. What is z_0.125?
   b. What is z_1.00?
 
4. What is the z-score for
   a. area 0.5600 on its left?
   b. area 0.0282 on its right?

5. Find the two z-scores that divide the area under the curve into a middle 0.90 area and two outside 0.050 areas.

6. IQ’s are normally distributed with mean 100 and standard deviation 16. Obtain the probability that a randomly selected person has IQ between 80 and 120.

7. Obtain the 75th percentile for I.Q.'s.

8. These scores were seen on a recent test for Stats; is the distribution "normal"? (You must use a normal probability plot.)



 

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