QUANT CONCEPTS + QUIZ #9

AVERAGES

The average value is also known as mean value or arithmetic mean.

Average= Sum of quantities or observations/total number of observations

Now try to solve these 10 questions as fast as possible (5-7 min)

1.    The marks of a student in English, Mathematics, Physics and Chemistry are respectively 59, 82, 76 and 43. Find the average marks?

            (a)  59                           (b) 61

            (c) 65                           (d) 67

2.    In a family of five members, the age of father is 42 years, mother is 38 years and sum of three children’s ages is 80 years. Find the average age of the family.

            (a)  36                           (b) 30  

            (c) 32                           (d) 41  

3.    The average temperature of Monday, Tuesday, Wednesday and Friday is 58 degree. The average temperature of Monday, Tuesday, Thursday and Friday is 62 degree. The ratio of temperature of Wednesday and Thursday is 15:19. Find the temperatures of Wednesday and Thursday.(answers in degree)

            (a)  62, 78                    (b) 60, 76   

            (c) 63, 74                     (d) 60, 74

4.    A person divides his total distance of journey into three equal parts and decides to travel the three parts with speeds 40, 30 and 15kmph respectively. Find his average speed.

            (a)  24 kmph                (b) 25 kmph 

            (c) 28.3 kmph             (d) 24.2 kmph

5.    A batsman makes a score of 87 runs in the 17^th innings and thus increases his average by 3. Find his average after 17^th innings.

            (a)  39                           (b) 35.5   

            (c) 40                           (d) 39.5

6.    The average monthly salary of 660 workers in a factory is Rs. 380. The average monthly salary of officers is Rs. 2100 and the average monthly salary of the other workers is Rs. 340. The number of other workers is:

            (a)  645                         (b) 647

            (c) 650                         (d) 850

7.    The average of 25 results is 18. The average of first 12 of those is 14 and the average of last 12 is 17. What is the 13^th result?

            (a)  78                           (b) 48 

            (c) 68                           (d) 75

8.    Of the three numbers the first is twice the second and the second is twice the third. The average of the three numbers is 35. What are the numbers?

            (a)  15, 30, 60              (b) 20, 40, 80

            (c) 18, 36, 72              (d) 10, 20, 40

9.    Visitors to a show were charged Rs. 15 each on the first day, Rs 7.5 on the second, Rs. 2.5 on the third day and the total attendance on the three days were in the ration 2:5:13 resp. Find the average change per person for the while show?

            (a)  Rs. 5                      (b) Rs. 5.50

            (c) Rs. 6                      (d) Rs. 7

10.  The average expenditure of a man for the first five months of a year is Rs. 5000 and for the next seven months is at Rs. 5400. He saves Rs 2300 during the year. His average monthly income is?

            (a)  Rs. 5425                (b) Rs. 5500

            (c) Rs. 5446                (d) Rs. 5600

SOLUTIONS

Q	Ans	Q	Ans
1	c	6	a
2	c	7	a
3	b	8	a
4	a	9	a
5	a	10	a

Time taken

Within 5 min: EXCELLENT

5-7 min: YOU CAN DO BETTER

More than 7 min: YOU NEED TO WORK HARD