1. Test Review

2.  Scores on the math section of the SAT are normally distributed with a mean of 650 and a standard deviation of 50. What percentage of the math scores are between 500 - 800?  99.7%

3.  Weight is normally distributed with a mean of 100 lbs and a standard deviation of 15. What percentage of people fall between 70 - 100?  47.75%

4.  Scores on the Social Studies section of the GHSGT are normally distributed with a mean of 210 and a standard deviation of 20. What is the percent of social studies scores that fall between 190 - 270?  84%

5.  Soccer goals by year are normally distributed with a mean of 55 and a standard deviation of 3. Find the z-score for 50.  -1.67

6.  Juan’s grades are normally distributed with a mean of 78 with a standard deviation of 5. What is the z-score for 85?  1.40

7.  The temperatures for September are normally distributed with a mean of 94º and standard deviation of 2º. What is the z-score for 91º?  -1.50

8.  Snowfall in January is normally distributed with a mean of 4.5” and a standard deviation of.5”. What percent of the data is below 5.1”?  88.49%

9.  Love Poems in Mr. Kirkpatrick’s mailbox average 7 per day with a standard deviation of 2. What percent of the data is more than 9?  15.87%

10.  Find the percent that gives the following z-score: 1.57  94.18%

11.  Find the percent that gives the following z-score: -.42  33.72%

12.  Find the z-score that is closest to having the exact percentage of 56% .15

13.  Find the z-score that is closest to having the exact percentage of 21%  -.81

14.  What are the two z-scores that contain middle 30% of the data?  -.39,.39

15.  What are the two z-scores that contain middle 80% of the data?  -1.28, 1.28

16.  Gas mileage for a Toyota Prius is 44 mpg with a standard deviation of 3. The middle 60% of these cars have a mileage between _____ and _____.  41.5, 46.5

17.  Gas mileage for a Toyota Tacoma is 21 mpg with a standard deviation of 2. The middle 64% of these cars have a mileage between _____ and _____.  19.2, 22.8

18.  A sample of 64 juniors at Southeast have an average IQ of 76 with a standard deviation of 4. Construct a 95% Confidence level for mean IQ.  75.02, 76.98

19.  A sample of 30 freshmen at Southeast have an average IQ of 50 with a standard deviation of 3. Construct a 99% Confidence level for mean IQ.  48.59, 51.41

20.  A recent study was conducted at Southeast High School to examine who was the most loved teacher. Of the 30 students polled, 60% selected Mr. Kirkpatrick. Construct a 95% Confidence Interval for the population percentage for Mr. Kirkpatrick.  42.6%, 77.4%

21.  A recent study was conducted at Southeast High School to examine who was the most hated teacher. Of the 50 students polled, 85% selected Mr. Appelman. Construct a 99% Confidence Interval for the population percentage for Mr. Appelman.  72.1%, 97.9%