AMC 8 Data Analysis & Statistics

Question 1

The test scores of 5 students are 72, 85, 90, 68, and 95. What is the mean score?

Accepted Answer

82

Answer

The mean is (72+85+90+68+95)/5 = 410/5 = 82.

Question 2

The ages of seven children are 8, 11, 7, 9, 12, 10, and 9. What is the median age?

Accepted Answer

9

Answer

Sorted in order: 7, 8, 9, 9, 10, 11, 12 — the middle (4th) value is 9.

Question 3

In a class, monthly books read: 5 students read 1 book, 8 read 2, 4 read 3, and 3 read 4. What is the mode?

Accepted Answer

2

Answer

The mode is 2 because it appears most frequently — 8 students read 2 books.

Question 4

The high temperatures for a week were 72, 68, 75, 80, 65, 70, and 74 degrees. What is the range?

Accepted Answer

15

Answer

Range = maximum − minimum = 80 − 65 = 15.

Question 5

A bar graph shows enrollment per grade: Grade 5 has 120, Grade 6 has 135, Grade 7 has 115, and Grade 8 has 130 students. What is the total enrollment?

Accepted Answer

500

Answer

Total = 120 + 135 + 115 + 130 = 500 students.

AMC 8 - American Mathematics Competition 8 Practice Test

AMC 8 - American Mathematics Competition 8 Practice Test

AMC 8 Data Analysis & Statistics