Question 1
1 Mark
Following table shows the subjectwise marks scored by a student in a summative test. Find the average marks.
Options
Option A is correct
40
Option B
38
Option C
42
Option D
36
Questions & Answers: "Average"
Complete guide to "Average" for Math students. Below you will find important questions and model answers to help you prepare.
8 Questions
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We are building a dedicated quiz for this topic, but you can test your skills on a similar concept: Geometry (Angles, Circles, and 3D Nets) - Scholarship-VIII Practice Set 1.
Question 2
1 Mark
Average weight of Siya and Nisha is 29 kg. Average weight of Fiza and Siya is 26 kg. If the total weight of Nisha and Fiza is 50 kg., what will be the maximum weight (in kg.) amongst the three girls?
Options
Option A
25
Option B
28
Option C is correct
30
Option D
34
Question 3
1 Mark
A car travelled the distance 38 km, 27 km, 40 km, 35 km in the first four hours respectively. How much distance the car should travel in the fifth hour, so that the average speed of the car will be 35 km/hr?
Options
Option A
25 km
Option B
40 km
Option C
45 km
Option D is correct
35 km
Question 4
1 Mark
The average of 10 numbers is 20. Out of which the average of first 6 numbers is 15. The average of last 3 numbers is 16 then what will be the seventh number?
Options
Option A
72
Option B is correct
62
Option C
52
Option D
60
Question 5
1 Mark
The average age of Ria and her 4 friends is 24 years. Their ages are (3m – 2), (2m + 7), (4m – 7), (3m), (3m + 2) respectively. Find the value of ‘m’
Options
Option A
7
Option B
9
Option C is correct
8
Option D
5
Question 6
1 Mark
In a class the average age of 41 students was 13.5 years. If the age of the class-teacher is added to the total ages of the students, then the average age increases by 6 months. Find the age of the class teacher.
Options
Option A
43 years 6 months
Option B is correct
34 years 6 months
Option C
35 years 6 months
Option D
36 years 6 months
Question 7
1 Mark
The mean of 25, 18, x, 20, 17, 20, 21, 25 is 21. Find the value of x.
Options
Option A
24
Option B
20
Option C
23
Option D is correct
22
Explanation
The mean of a set of numbers is the sum of the numbers divided by the count of the numbers. Given numbers are 25, 18, x, 20, 17, 20, 21, 25. The count of numbers is 8. The mean is 21. Sum of numbers = 25 + 18 + x + 20 + 17 + 20 + 21 + 25 = 146 + x. So, (146 + x) / 8 = 21. Multiplying both sides by 8, we get 146 + x = 21 * 8 = 168. Therefore, x = 168 - 146 = 22.
Question 8
1 Mark
Find the average of the cubes of first five odd natural numbers.
Options
Option A
235
Option B
255
Option C is correct
245
Option D
285
Explanation
The first five odd natural numbers are . We need to find the cubes of these numbers: Now, we find the sum of these cubes: Sum . The number of terms is . The average is the sum divided by the number of terms: Average . Therefore, the average of the cubes of the first five odd natural numbers is .