1

If a store initially sells a product for $80 but then decreases the price by 20%, what is the new price?

A) $60

B) $72

C) $64

D) $75

2

If a car originally costs $20,000 and depreciates by 10% each year, what will be its value after 3 years?

A) $14,580

B) $15,000

C) $16,000

D) $15,200

3

If a pizza is cut into 8 equal slices and you eat 3 slices, what percentage of the pizza did you eat?

A) 30%

B) 40%

C) 46%

D) 37.50%

4

In a shipment, item weights (in kilograms) are 9, x, 25, 13, and 33. With a mean of 19 and a Mean Absolute Deviation (MAD) of 8 kilograms, find the value of 'x'.

A) 17

B) 15

C) 11

D) 22

5

Calculate the mean absolute deviation (MAD) for the heights (in centimeters) of a group of students: 160, 165, 170, 175, 180, and 185.

A) 7.5

B) 6.9

C) 7.8

D) 6.4

6

In a class, student ages are 18, 19, 20, 21, 22, x, and 24. With a mean of 21 and a mean absolute deviation of 1.714, determine the value of 'x' and the sum of 'x' and the lower value.

A) 44 and 33

B) 23 and 41

C) 33 and 38

D) 23 and 33

7

The weights of 8 boxes are measured in ounces: 5.2, 4.9, 5.5, 5.3, 5.1, 5.4, 5.6, and 5.0. Find the standard deviation of these weights.

A) 0.3761 ounces

B) 0.290 ounces

C) 0.23 ounces

D) 0.2801 ounces

8

The heights (in inches) of a group of 12 students are measured as follows: 60, 62, 65, 64, 61, 63, 68, 66, 67, 59, 63, and 70. Determine the standard deviation of these heights.

A) 3.86 inches

B) 4.97 inches

C) 5.18 inches

D) 3.2 inches

9

At the end of the fall semester, a math class of ninth graders had the following grades: 85, 75, 97, 83, 62, 75, 88, 84, 92, and 89. What is the standard deviation of this class?

A) 9.54

B) 8.79

C) 8.02

D) 9.81

10

In the high school boys population, the height variance, measured in inches, was found to be 16. Assuming that the height data is normally distributed, 95% of high school boys should have a height within how many inches of the mean?

A) 16

B) 8

C) 9

D) 14