1) Not everyone pays the same price for the same model of a car. The figure illustrates a normal distribution for the prices paid for a particular model of a new car. The mean is $19,000 and the standard deviation is $ 1000. Use the 68-95-99.7 Rule to find the percentage of buyers who paid less than $18,000.

The percentage of buyers who paid less than $ 18, 000 is?

2) Scores on the GRE(Graduate RecordExamination) are normally distributed with a mean of 513 and a standard deviation of 115. Use the 68-95-99.7 Rule to find the percentage of people taking the test who score below 168.

The percentage of people taking the test who score below 168 is ?

3) Scores on the GRE(Graduate RecordExamination) are normally distributed with a mean of 523 and a standard deviation of 70. Use the 68-95-99.7 Rule to find the percentage of people taking the test who score above 733.

The percentage of people taking the test who score above 733 is?

4) Scores on a dental anxiety scale range from 0(no anxiety) to 20(extreme anxiety). The scores are normally distributed with a mean of 11 and a standard deviation of 4. Find thez-score for the given score on this dental anxiety scale.

z12: