Applying Average in Everyday Life

Q. The average age of a class of 40 students is 12 years. The average age including the teacher becomes 13 years. How old is the teacher?

Q. The average of first 3 prime numbers is :

1. 3
2. 3.33
3. 2.5
4. 3.67

Q.

The mean weight per student in a group of 7 students is 55 kg.The individual weight of 6 of them (in kg) are 52, 54, 55, 53, 56 and 54. Find the weight of the seventh student.

1. 61

2. 58

3. 60

4. 57

Q.

A female grizzly bear weighs 500 pounds. After hibernating for 6 months, she weighs only 350 pounds. What is the mean monthly change in weight?

Q. The average of first 5 multiples of 2 is __-.

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

Q.

A set of data arranged in ascending order is given

3, 5, 10, 12, $x$, 15, 20, 21, 29

Find the value of $x$ if mean of the given numbers is 12.

1. 12

2. 13

3. 14

4. 15

Q.

Question 5 (c)

Following is the list of temperatures of five places in India, on a particular day of the year
Place Temperature
Siachin ${10}^{\circ }Cbelow{0}^{\circ }C$ ___
Shimla $2^{\circ }Cbelow{0}^{\circ }$ ___
Ahmedabad ${30}^{\circ }Cabove{0}^{\circ }$ ___
Delhi ${20}^{\circ }Cabove{0}^{\circ }$ ___
Srinagar $5^{\circ }Cbelow{0}^{\circ }$ ___
Which is the coolest place?

Q.

The middle number among 13 consecutive natural numbers is 31. Find the sum of the 13 numbers?

Q. The height of Manish is 6 feet. How tall is Manish in cm?

1. 182.98 cm
2. 182.88 cm
3. 182.68 cm
4. 182.78 cm

Q.

The weights of 5 players of a team are : 55 kgs , 71 kgs , 62 kgs , 68 kgs and 59 kgs.

What is the average weight of the team?

1. 61 kgs

2. 67.5 kgs

3. 65 kgs

4. 63 kgs

Q. A person recorded the speed (in km/hr) of 10 motorists as 48, 52, 57, 55, 45, 39, 61, 49, 51 and 43. The average speed of the motorists is

1. 50 km/hr
2. 57 km/hr
3. 55 km/hr
4. 54 km/hr

Q.

Question 5 (a)

Following is the list of temperatures of five places in India, on a particular day of the year.
Place Temperaturee
Siachin ${10}^{\circ }Cbelow{0}^{\circ }C$ ___
Shimla $2^{\circ }Cbelow{0}^{\circ }$ ___
Ahmedabad ${30}^{\circ }Cabove{0}^{\circ }$ ___
Delhi ${20}^{\circ }Cabove{0}^{\circ }$ ___
Srinagar $5^{\circ }Cbelow{0}^{\circ }$ ___

Write the temperature of these places in the form of integers in the blank column.

Q. Height of five people A, B, C, D, E are given as follows:
165 cm, 1.8 m, 72 inches, 5.9 feet, 2.1 yards
Arrange A, B, C, D, E in ascending order.
(1 yard = 3 feet
1 feet = 12 inches
1 inch = 2.54cm)

1. A, D, B, C, E
2. A, D, C, B, E
3. A, D, E, C, B
4. A, D, E, B, C

Q. The average score of 20 boys in a class is 45 and the average score of 36 students in the same class is 40. What is the average score of the girls in the class?

1. 24.5
2. 29.45
3. 28.125
4. 30

Q.

The average age of a class of 50 students is 12. The average age including the teacher becomes 13.

How old is the teacher?

1. 55

2. 63

3. 60

4. 70

Q. The weights of players in a team are $68\text{kilograms},72\text{kilograms},80\text{kilograms},70\text{kilograms},60\text{kilograms},70\text{kilograms}$. What is the average weight of a player in the team? $\left[2\right]$

Q.

A person recorded the speed (in km/hr) of 10 motorists as 48, 52, 57, 55, 45, 39, 61, 49, 51 and 43. What is the average speed of the motorists?

1. 57 km/hr

2. 50 km/hr

3. 55 km/hr

4. 54 km/hr

Q.

Find the average salary of a worker in a factory of $50$ workers, where the average salary of $22$ of them is $₹150$ and that of rest is $₹140.$

Q. If the mean a, b, c, d and e is 28, mean of a, c and e is 24 and mean of b and d is $n^2-2$, then the value of n is $\pm k$, where k is

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

Q.

Cost of milk goes up by ₹2 on the sixth day of the week. If the cost on Monday was ₹30, then what is the average cost of milk for 7 days?

1. ₹30.57

2. ₹35

3. ₹32.5

4. ₹28

Q. Only meaningful data helps us to analyse the data .

1. incorrectly
2. correctly
3. wrongly

Q. Average age of employees working in a department is 30 years. In the next year, ten workers will retire. What will be the average age in the next year?
I. Retirement age is 60 years.
II. There are 50 employees in the department.

1. I alone sufficient while II alone not sufficient to answer
2. II alone sufficient while I alone not sufficient to answer
3. Either I or II alone sufficient to answer
4. Both I and II are not sufficient to answer
5. Both I and II are necessary to answer

Q.

Find the average of 100, 110 and 105.

1. 22.75

2. 46.5

3. 119.25

4. 66.75

Q.

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

1. 36

2. 26

3. 56

4. 16

Q.

Ram's average saving is ₹ 4500 for 6 months and ₹ 5200 for next 6 months.

What is his average yearly saving?

1. ₹ 4600

2. ₹ 5000

3. ₹ 4850

4. ₹ 4700

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.

The set of multiples of 8 is __________ .

1. a finite set

2. an infinite set

3. not a set

4. a null set

Q.

The following amounts are the income for 5 days calculated by a man.

₹760, ₹820, ₹745, ₹782 and ₹779.

If the average income is ₹775 for 6 days, what is the income on the sixth day?

1. ₹769
2. ₹764
3. ₹760
4. ₹774

Q.

When a person calculated his average expenses from Monday to friday, it was ₹ 400. When he calculated from Monday to Saturday it was ₹ 450.

What was his expenditure on Saturday?

1. ₹ 600

2. ₹ 450

3. ₹ 750

4. ₹ 700

Q.

When a person calculated his average expenses from Monday to friday, it was ₹ 400. When he calculated from Monday to Saturday it was ₹ 450.

What was his expenditure on Saturday?