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Q401

The average of 9 observations was found to be 35. Later on, it was detected that an observation 81 was misread as 18. The correct average of the observation is -

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Q402

Out of 20 boys, 6 are each of 1 m 15 cm height, 8 are of 1 m 10 cm and rest of 1 m 12 cm. The average height of all of them is :

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Q403

The average of the largest and smallest 3 digits numbers formed by 0, 2 and 4 would be :

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Q404

The average of five numbers is 7. If three new numbers would be added, then the new average comes out to be 8.5. What is the average of those three new numbers ?

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Q405

The average age of a family with 5 members is 28. If one of the 5 members of age 20 is excluded the average age of the family becomes -

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Q406

The average of 6 observations is 45.5. If one new observation is added to the previous observations, then the new average becomes 47. The new observation is :

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Q407

The average pocket money of 3 friend A, B, C is Rs. 80 in a particular month. If B spends double and C spends triple of what A spends during that month and if the average of their unspent pocket money is Rs. 60, then A spends (in Rs.)-

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Q408

The average age of group of 20 girls is 15 years and that of another group of 25 boys it is 24 years. The average age of the two groups mixed together is :

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Q409

The average of nine number is 50. The average of first five numbers is 54 and that of the last three numbers is 52. Then the sixth number is :

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Q410

From a class of 42 boys, a boy aged 10 years goes away and in his place, a new boy is admitted. If on account of this change, the average age of the boys in that class increases by 2 months, the age of the newcomer is :

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Q411

A scored 73, 76, 20 and 7 runs in four out of five innings. What should be his score in fifth innings. If he has to make an average of 55 run in five innings.

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Q412

Sonali applied for a job of Science teacher in a school. In the test for job, she scored 8 in Physics, 8 in Chemistry, 6 in Biology, and 6.5 in the interview. For calculating the final score, weightage of 2, 3, 3 and 4 were assigned to Physics, Chemistry, Biology and interview, respectively. What is the weighted average score of Sonali?

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Q413

The average weight of A, B and C is 65 kg. If the average weight of C and B is 61.5 kg, and the average weight of A and C is 68.5 kg, then the weight of C (in kg) is:

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Q414

The average of 5 consecutive odd numbers is 27. What is the product of the first and the last number?

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Q415

The average age of a class of 6 girls is x years. Four new girls having ages x - 2, x + 2, x + 4 and x + 6 join the class. What is the new average age (in years) of the class?

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Q416

Find the average of cubes of first 49 positive integers.

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Q417

The average revenues of 7 consecutive years is Rs. 83 lakhs. The average of first 4 years is Rs. 78 lakhs and that of last 4 years is Rs. 90 lakhs, find the revenue for the 4^th year.

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Q418

The average of the marks of 25 students in a class, in an examination was calculated to be 19. Later, the teacher realized that the marks of two students were taken as 18 and 19 respectively, instead of 14 and 15. Find the new actual average marks of the class.

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Q419

If the average of s number is r⁴ and the average of r numbers is s⁴, then find the average of all r + s numbers?

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Q420

The average of 22 number is 52. The average of the first 8 numbers is 48 and the average of next 11 number is 54 the 20^th number is 7 less than the 21^st number and 21^st number is 4 more than 22^nd number. What is the average of the 20^th and 22^nd number?

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