Statistics and Average

1. If 8x + 8y = 64, what is the average of x and y?

• ক. 16
• খ. 4
• গ. 0
• ঘ. 1

2. The average mark obtained by 15 students was 10 and the average mark obtained by 10 students was 15. What was the average mark obtained by all students?

• ক. 10
• খ. 8
• গ. 12
• ঘ. 15

3. If the average of four numbers k, 2k + 3, 3k - 5, and 5k + 1 is 63. What is the value of k?

• ক. 11
• খ. 15.75
• গ. 22
• ঘ. 23

4. The addition of 10 digits is 462. The average of their first four digits is 52 and the average of last 5 digits is 38. What is the fifth digit?

• ক. 64
• খ. 60
• গ. 50
• ঘ. 62

5. The average of 5 numbers is 40. If 2 more numbers with an average of 21 are added to these numbers, what will be the average of the combined numbers?

• ক. 8.7
• খ. 30.1
• গ. 30.3
• ঘ. 34.6

6. What is the maximum number of half-pint bottles of cream that can be filled with a 4-gallon can of cream? (2 pt. = 1 qt. and 4 qt. = 1 gal)

• ক. 16
• খ. 24
• গ. 30
• ঘ. 64

7. The of 5 quantities is 6. The average of 3 of them is 8. What is the average of the remaining two numbers?

• ক. 6.5
• খ. 4
• গ. 3
• ঘ. 3.5

8. When a student weighting 45 kgs left a class, the average weight of the remaining 59 students increased by 200g. What is the average weight of the remaining 59 students?

• ক. 57 kgs
• খ. 56.8 kgs
• গ. 58.2 kgs
• ঘ. 52.2 kgs

9. The average temperature on Wednesday,Thursday and Friday was 25°c. The average temperature on Thursday, Friday and Saturday was 24°c. If the temperature on saterday was 27°c, what was the temperature on Wednesday?

• ক. 24°c
• খ. 21°c
• গ. 27°c
• ঘ. 30°c

10. The average of a, b, c is 6 and a - b = 4, ab = 21, what is the value of c?

• ক. 6
• খ. 7
• গ. 8
• ঘ. 9

11. In a class of 22 students, 21 students get an average of 44 marks. If the remaining students get 66 marks, the average marks of the whole class is--

• ক. 30
• খ. 45
• গ. 15
• ঘ. None of these

12. If the sum of (8, 5 and x) is 21, then the average of (8, 5 and x) is--

• ক. 7
• খ. 9
• গ. 2
• ঘ. 3.5

13. The average age of 40 employees in abranch of a bank is 35 years. When a new employee joined the bank the average age increased to 35.5 years. What is the age of the new employee?

• ক. 55.5
• খ. 50
• গ. 50.5
• ঘ. 20.5

14. In company X, the average salary of 10 of the employees is Tk.30000, the average salary of 30 other employees is Tk.40000 and the average salary of the remaining 20 employees Tk.60000. What is the average salary of the 60 employees at the company?

• ক. Tk.40000
• খ. Tk.43000
• গ. Tk.45000
• ঘ. Tk.60000

15. Jamil's average score in 4 tests was 80 out of a possible 100. If his scores in 2 of the tests were 65 and 70, what is the lowest that either of his other scores could have been?

• ক. 70
• খ. 80
• গ. 90
• ঘ. 85

16. The average weight for a group of 20 women is 130 pounds. If the average weight for 75% of these women was 140 pounds, what was the average weight in pounds for the rest of the women?

• ক. 100
• খ. 110
• গ. 120
• ঘ. 135

17. A train passes city X at 8.25 am and city Y at 11.05 am. The distance between city X and Y is 320 miles. What is the average speed in miles per hour of the train?

• ক. 135
• খ. 120
• গ. 270
• ঘ. None of these

18. A car travles 180 km from A to B at 60 kilometers/hour and returns from B to A along the same route at 90 kilometers/hour. The average speed in kilometers per hour for the round trip is:

• ক. 72
• খ. 36
• গ. 180
• ঘ. 30

19. Razia spent 3 hours climbing 6 miles up a hill. She spent 2 hours coming down the hill on a different path which had a length of 8 miles. For Razia's completed climb up and down the hill, what was her average speed in miles per hour?

• ক. 2.0
• খ. 2.5
• গ. 2.8
• ঘ. 3.0

20. If Tk.45000 was invested in the share market when the price per share was Tk.90 and Tk.30000 was invested when the price per share was Tk.100, what was the average price per share purchesd?

• ক. Tk.96.25
• খ. Tk.95.00
• গ. Tk.94.00
• ঘ. Tk.93.75

21. The average of 6 numbers is 25. If 3 more numbers with an average of 22 are added to these numbers, what will be the average of the combined 9 numbers?

• ক. 20
• খ. 22
• গ. 24
• ঘ. 25

22. If 6 and x have the same mean as 2, 4 and 24, what is the value of x?

• ক. 5
• খ. 10
• গ. 14
• ঘ. 36

23. If the sum of (3, 7 and x) is 18, then the average of (3, 7 and x) is--

• ক. 6
• খ. 7
• গ. 8
• ঘ. 9

24. What is the average of 0.36, 4.6, 0.64 and 2.4?

• ক. 1
• খ. 2
• গ. 2.5
• ঘ. 10

25. Salma's average in four tests is 80%. What mark does she need score in her fifth test to make her average 84%?

• ক. 100%
• খ. 94%
• গ. 84%
• ঘ. 96%