Mean

Q.

If each observation of the data is increased by 3, then their mean

1. Is increased by 3

2. Is increased by 6

3. Does not increase

4. Is decreased by 3

Q. he average of 50 numbers is 20. If two numbers 37 and 43 are discarded, find the average of the remaining numbers.
$\left[3Marks\right]$

Q.

The mean of 200 items was 50. Later on, it was discovered that the two items were misread as 92 and 8 instead of 192 and 88. Find the correct mean.

1. 51

2. 48.8

3. 50

4. 50.9

Q.

A class teacher has the following absentee record of $40$students of a class for the whole term. Find the mean number of days a student was absent.

Number of days	0-6	6-10	10-14	14-20	20-28	28-38	38-40
Number of students	11	10	7	4	4	3	1

Q. Find the Mean of the following set of numbers.
16, 18, 19, 21, 23, 23, 27, 29, 29, 35

1. 23
2. 24
3. 31
4. 30

Q. What is the mean of the numbers 5, 6 and 7

1. 5
2. 6
3. 18
4. 4

Q. Find mean of the following data.

23

24

25

26

27

28

1. 25.5

Q. Find the mean of the following data:
9, 7, 11, 13, 2, 4, 5, 5

1. 56
2. 4
3. 7
4. 6

Q.

Find the range of heights of any ten students of your class.

Q. Weights in kg for 10 students are given below. Find the mean.
39, 43, 36, 38, 46, 51, 33, 44, 44, 43

1. 41.7
2. 39.09
3. 37
4. 36

Q.

What is the difference between the mean and median of first 11 natural numbers?

1. 1.33

2. 2

3. 0

4. -2

Q. There are 8 teachers in a school. When a 35 year old teacher was transferred and another teacher joined, the average age was increased by 2 years. How old is the new teacher?

Q. In a club, the average age of the members is 30 years, the average age of the male members is 34 years and that of the female members is 26 years. The percentage of male members is:

Q.

The average of first two prime numbers is ___________

1. 5.4
2. 4.5
3. 4.25
4. 6

Q.

Following marks were obtained by $12$ students in a Mathematics test (out of $50$) :

$46,33,21,17,49,10,31,37,18,35,41,8$

What is the range of marks ?

Find the mean If the marks of the student who scored only $8$ marks are increased to $10$, find the new mean.

Q.

Sum of the observations divided by the number of observations is called as _____

1. Class width
2. Class sizes
3. Range
4. Class frequencies

Q. The average of seven numbers is 6. What is the eighth number to be added to increase the average to 10?

1. 28
2. 38
3. 48
4. 58

Q.

Find the mean of the squares of the first five natural numbers.

1. 10

2. 13

3. 50

4. 91

Q. Which of the following statements are correct about mean?

1. Mean always lies between the largest and smallest value in the given data set.
2. Mean can be used for both numerical data set and categorical data set.
3. Mean has to be one of the given data values.
4. Mean of given data points is basically known as the average of the given data points.

Q.

Find the mean of first six odd numbers ending with 1 .

1. 36

2. 26

3. 56

4. 16

Q. Find the mean of the following data.

Data 1	Data 2	Data 3	Data 4	Data 5
$1$	$3$	$5$	$7$	$9$

1. $5$
2. $25$
3. $0.5$
4. $0.25$

Q. What is the mean of first 10 natural numbers?

1. 5.5
2. 4.5
3. 6.5
4. 6

Q.

The mean of $10,6,13,x+3,2$and $2x-1$is $9$. The value of $x$is-

1. $7$

2. $8$

3. $9$

4. $6$

Q.

The weight of students from a class 52, 54, 55, 53, 56 , 54 , 54. Find their mean

1. 57 kg

2. 60 kg

3. 54 kg

4. 58 kg

Q. Find the mean of:

vi. $5,2.4,6.2,8.9,4.1$ and $3.4$

Q. The test scores of two students are given. The mean of student 1 is the mean of student 2.

1. <
2. >
3. =

Q.

The average of 3.5 and 3.5 is _________

1. 4.5

2. 3.5

3. 2.5

4. 7

Q.

The mean of 100 observations is 50.5. The sum of all the observations is:

1. 5000

2. 5050

3. 5005

4. 5105

Q. Average is a single value that can be used to represent an entire data set and can be used to compare multiple sets.

1. True
2. False

Q. Find the average of all numbers between 6 and 34 which are divisible by 5 ?

1. 20
2. 15
3. 25
4. 30