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Following quiz provides Multiple Choice Questions (MCQs) related to **Averages**. You will have to read all the given answers and click over the correct answer. If you are not sure about the answer then you can check the answer using **Show Answer** button. You can use **Next Quiz** button to check new set of questions in the quiz.

Q 1 - 18 is the mean of 5 numbers. What should be the exclude number if the average became 16 after excluding number?

5 number have the total sum = (18*5)= 90 4 number have the total sum = (16*4)= 64 So, the exclude number is = (90-64)= 26.

Q 2 - 44 is the average of 100 numbers. If we add 4 new numbers in 100 numbers then average will be 50 then what should be the average value of new 4 numbers?

The value of 100 number= (44*100) = 4400 The value of 104 number = ( 50*104)= 5200 ∴ value of 4 new number = 5200- 4400 = 800 Then the average value of the 4 numbers = 800/4 = 200

Q 3 - 38°C is the average temperature of 4 day Monday , Tuesday , Wednesday and Thursday while 40°C is the average temperature of Tuesday, Wednesday , Thursday and Friday. On Monday 30° C temperature recorded. Find out the temperature on Friday?

M+T+W+Th = (38*4)= 152 ...(i) T+W+Th+F = (40*4) =160 ...(ii) After subtracting (ii)-(i) we find that f-M =8 ⇒ F-30 =8 ⇒ F =38. ∴ 38° C is the temperature on Friday.

Q 4 - What should be the average speed of the train if first 12 min. travelled by train at a speed of 30km/hr and after that speed increased and with the speed of 45km/hr travelled for next 8 min?

Total covered distance by train = (30*12/60+45* 8/60) = 12 km Total time taken by train to cover the distance = 12+8 = 20min = 1/3 hours. Required average speed = 12*3/1 = 36 km/hr.

Q 5 - In 11 innings a certain average has been made by a player. In the next innings he made 90 runs and his average have downfall with 5 runs. What will be the average of that player after 12 innings?

If x is the average of run in 11 innings. Then, 11x+90 =(x-5)*12 ⇒ x= 150 Average run rate after 12th innings = (11x+90 )/12 =(11*150+90)/12= 145

Q 6 - Rs. 450 is average of 5 shirts and Rs.750 is the average of 4 trousers and 12 pair of shoes average is also Rs.750. Find out the average expenditure per product?

sum of the all items = (450*5 +750*4+750*12) = Rs. 14250 Average expenditure per product = Rs. 14250/21 = Rs. 678.21

Q 7 - A company produces on an average 4000 items per month for the first 3 months. How many items it must produce on an average per month over the next 9 months, to average 4375 items per month over the whole?

**Answer - A**

**Explanation**

Required average =^{(4375 x 12) - (4000 x 3)}⁄_{9}=^{52500 - 12000}⁄_{9}=^{40500}⁄_{9}= 4500.

Q 8 - If the arithmetic mean of seventy-five numbers is calculated, it is 35. If each number is increased by 5, then mean of new number is?

**Answer - D**

**Explanation**

A.M. of 75 numbers = 35. Sum of 75 numbers = (75 x 35) = 2625. Total increase = (75 x 5) = 375. Increased sum = (2625 + 375) = 3000. Increased average =^{3000}⁄_{75}= 40.

Q 9 The average weight of 8 persons increases by 2.5kg when a new person comes in place of one of them weighing 65kg . what might be the weight of the new person?

**Answer - A**

**Explanation**

Total weight increased = (8 x 2.5) kg = 20kg Weight of new person = (65 + 20) kg = 85kg.

Q 10 - The average weight of 3 men A, B, C is 84 kg. Another man D joins the group and the average now becomes 80kg. If another man E, whose weight is 3 kg more than that of D, replaces A, then the average weight of B, C, D, E becomes 79kg. The weight of A is?

**Answer - B**

**Explanation**

Let A, B, C, D and E represent their respective weights. Then, A + B + C = (84 x 3) = 252 kg, A + B + C + D = (80 x 4) = 320 kg. D = (320 - 252)kg = 68 kg, E = (68 + 3)kg = 71 kg. B + C + D + E = (79 x 4) = 316 kg Now, (A + B + C + D) - (B + C + D + E) = (320 - 316)kg = 4 kg A - E = 4 A = ( 4 + E ) = 75 kg.

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