Average Practice Questions

5 questions per page • Detailed step-by-step solutions

Question 26
Easy
Find the average of 46, 44, 48, 49, 63, 39 and 68.
A 51
B 52
C 50
D 59.5
Correct Answer: A

Explanation:

Step 1: Add all the values: 46 + 44 + 48 + 49 + 63 + 39 + 68 = 357. Step 2: Count the values: 7. Step 3: Average = 357 ÷ 7 = 51.
Question 27
Medium
The average marks of 80 students is 67. If the average of 60 of them is 60, what is the average of the remaining students?
A 74
B 90
C 22
D 88
Correct Answer: D

Explanation:

Step 1: Total marks of all 80 students = 80 × 67 = 5360. Step 2: Total of the 60 students = 60 × 60 = 3600, so the remaining 20 students have 5360 − 3600 = 1760. Step 3: Their average = 1760 ÷ 20 = 88.
Question 28
Medium
In a class, 80% of the students are boys. The average marks of the boys is 72 and that of the girls is 46. What is the average marks of the whole class?
A 59
B 51.2
C 67.8
D 66.8
Correct Answer: D

Explanation:

Step 1: Take 100 students: 80 boys and 20 girls. Step 2: Total marks = 80 × 72 + 20 × 46 = 5760 + 920 = 6680. Step 3: Class average = 6680 ÷ 100 = 66.8.
Question 29
Easy
The average of 7 consecutive odd numbers is 35. What is the largest number?
A 43
B 39
C 40
D 41
Correct Answer: D

Explanation:

Step 1: Consecutive odd numbers differ by 2, so they are equally spaced and their average sits in the middle. Step 2: 7 numbers span 2 × (7 − 1) = 12, so they run from 35 − 6 = 29 to 35 + 6 = 41: 29, 31, 33, 35, 37, 39 and 41. Step 3: Required value = 41.
Question 30
Easy
Find the average of 68, 71, 75, 81 and 60.
A 72
B 70
C 71
D 88.75
Correct Answer: C

Explanation:

Step 1: Add all the values: 68 + 71 + 75 + 81 + 60 = 355. Step 2: Count the values: 5. Step 3: Average = 355 ÷ 5 = 71.