The mean is 100. Standard Deviation is 16 on a normal curve.
The question is:
If the distribution of mental ability scores is normal, the middle 68 percent of the scores should lie between what two scores?
answer: 84 to 116. How do you find this?
The next question is:
The middle 96 percent of the mental ability scores should be between what two values?
answer: 68 to 132
Its killing me.