Average

Q.

Why is Geometric Mean Better than Arithmetic?

Q.

Find the mean of first five multiples of 5.

___

Q.

Define arithmetic mean?

Q.

The mean of 6, 8, x+2, 10, 2x-1 and 2 is 9. Find the value of x.

1. 40

2. 30

3. 50

4. 60

Q. Find the average of first six odd numbers ending with 1 .

1. 24
2. 26
3. 28
4. 22

Q.

What is the average weekly temperature of Siachen if the temperatures for each day are as follows :

- ${11}^{\circ }$ , - ${16}^{\circ }$ , - ${12}^{\circ }$ , - ${8.5}^{\circ }$ , - ${14}^{\circ }$ , - ${17.5}^{\circ }$ and - ${15.5}^{\circ }$

1. - ${12.75}^{\circ }$

2. - ${14.5}^{\circ }$

3. - ${13}^{\circ }$

4. - ${13.5}^{\circ }$

Q.

A family consists of two grandparents, two parents and three grandchildren. The average age of the grandparents is $67$ years, that of the parents is $35$ years and that of the grandchildren is $6$ years. What is the average age of the family?

1. $28\frac{4}{7}\mathrm{years}$

2. $31\frac{5}{7}\mathrm{years}$

3. $32\frac{1}{7}\mathrm{years}$

4. None of these

Q. What is the average of the first ten Natural numbers?

1. 
   6
2. 
   5
3. 
   6.5
4. 
   5.5

Q.

Find the median of the following data:

(iii) $92,35,67,85,72,81,56,51,42,69$

Q. The weight of the students (in kg) in a class is given as follows:

45, 40, 35, 30, 25, 45, 40, 20

What is the average weight of the class?

1. 
   40
2. 
   43
3. 
   35
4. 
   30

Q. The average of 5 observations $x+3,x+5,x+7,x+9,x+11$ is 14. Find the value of x.

1. 5
2. 6
3. 7
4. 8

Q. During the annual function of a school, a Women’s Self-helf Group had set up a snacks stall. Their sales every hour were worth Rs 960, Rs 830, Rs 945, Rs 800, Rs 847, Rs 970 respectively. What was the average of the hourly sales?

Q.

Find the average of the following data set.

12 86 45 78 23 56

1. 24
2. 50
3. 52
4. 48

Q. The average of 5 numbers is 18. If one number is excluded, then their average becomes 16. The excluded number is:

1. 33
2. 26
3. 16
4. 34

Q.

The number of pages in 6 books are : 145, 135, 148, 162, 150 and 154. Find the average number of pages per book.

1. 152

2. 145

3. 149

4. 146

Q.

Find the median of the data :

$1,7,7,4,9,6,4,5,6,4$

Q.

The work hours of an employee of Think and Learn is given below:

9, 10, 8, 11, 12, 10

Find his average working hours per day.

1. 8 hours
2. 9 hours
3. 10 hours
4. 11 hours

Q. Consider the following observations:

1, 2, 3, 4, 5

We know their average is 3. If I increase each observation by a value of 1; what will happen to the average?

1. 
   It will decrease by 1
2. 
   It will increase by 0.2
3. 
   It will increase by 1
4. 
   It remains the same

Q.

What is the average number of eggs consumed per day in 3 days if :

Day 1 : 2 dozen eggs consumed.

Day 2 : 20 eggs consumed.

Day 3 : 22 eggs consumed.

1. 20
2. 22
3. 24
4. 18

Q.

Find the mean of the following.

First eight odd natural numbers

Q.

Find the average of the following sets $48,23,13,54,7$.

Q. It is given that,

Sum of all observations = 45
Total number of observations = 9

What is the value of the average?

1. 
   5
2. 
   7
3. 
   10
4. 
   9

Q. The average of five numbers is $51$. If average of first three number is $42$ and average of last three numbers is $59$. Find the third number.

Q. A bus covers first 120 km in 2 hours, next 150 km in 3 hours and the last 60 km in 1 hour. Find the average speed of the bus.
$\left[2Marks\right]$

Q. The annual rainfall in Vijayawada in five years is given below.
690 mm, 600 mm, 500 mm, 730 mm, 490 mm
What is the average rainfall for those 5 years ?

1. 
   602 mm
2. 
   610 mm
3. 
   550 mm
4. 
   575 mm

Q. For the given data set:

2, 4, 5, 6, 7, X, 10, 11

The average is 6
What is the value of X ?

1. 
   2
2. 
   1
3. 
   3
4. 
   5

Q. In a class of 100 students, the average marks scored was 31. If the students who passed obtained an average of 42 marks and those who failed obtained an average of 20 marks, how many students passed the exam?

1. 40
2. 55
3. 50
4. 45

Q. Reena studies for 4 hours, 6 hours, 2 hours, and 8 hours respectively for four consecutive days. How many hours did she study daily on an average?

1. 5
2. 6
3. 3
4. 4

Q.

Find the median of the following data:

$24,26,16,16,21,17,30,28$

Q. The average of 5 observations is 12. If the average of the first 3 observations is 10, then find the average of the other two.

1. 10
2. 12
3. 15
4. 12.5