Unit 2 Review Name

Date Per

1. Elizabeth recorded the length in centimeters of the pinky fingers of 10 students in her math class. The results are shown in the table below. What is the mean absolute deviation for length of a pinky finger?

6.1 / 5.4 / 5.8 / 6.3 / 6.2
5.9 / 6.5 / 5.2 / 4.9 / 5.5

A 0.38 cm C 1.26 cm

B 0.42 cm D 5.78 cm

2. John and his friends all went to Braum’s and had some ice cream. Grace ate 4 ½ scoops of ice cream, Jakob ate 4 ¼ scoops, Brandon ate 3 ¾ scoops and John ate 2 ¼ scoops. What is the total number of scoops of ice cream the four of them ate together?

3. The mean absolute deviation of a data set is equal to zero. What can you conclude?

4 & 5 Explain the following terms.

4. The representative sample of a population

5. The mean absolute deviation

6. Bella recorded the height in inches of 5 students in her class. The results are shown below.

{60, 65, 55, 60, 55}

What is the mean absolute deviation of the data set?

A 1.6

B 3.2

C 59

7. Samantha wants to know the favorite restaurant of the residents of her town. To find out, she stands outside Chili’s and asks every fifth person that leaves the restaurant. Explain whether her conclusion is valid and invalid.

Use the tables for 8 - 10.

Bethany

9.6 / 9.7 / 10.2 / 9.9 / 9.5 / 9.5 / 9.8

Colton

10.1 / 9.8 / 9.7 / 10.2 / 9.5 / 9.5 / 9.6

Two students are competing in a chemistry competition. They each measured out 7 samples of liquid. Their goal is for each sample to be as close to 10 mL as possible. The measurements for each student’s 7 samples are shown in the tables above.

8. Find the mean of both data sets.

9. Calculate the mean absolute deviation for both data sets.

10. Explain how you can use your answer for Exercise 7 to determine which student’s measurements are most consistent.