model 6 find average of excluded number Section-Wise Topic Notes With Detailed Explanation And Example Questions

Question : 1

The average weight of 12 parcels is 1.8 kg. Addition of another new parcel reduces the average weight by 50 g. What is the weight of the new parcel ?

a) 1.10 kg

b) 1.15 kg

c) 1.50 kg

d) 1.01 kg

Question : 2

The average of five numbers is 27. If one number is excluded, the average becomes 25. The excluded number is :

a) 27

b) 30

c) 25

d) 35

Question : 3

The average of 50 numbers is 38. If two numbers namely 45 and 55 are discarded, the average of the remaining numbers is :

a) 32.5

b) 37.5

c) 35

d) 36

Question : 4

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?

a) 10.5

b) 11

c) 9

d) 11.5

Question : 5

The average of six numbers is 32. If each of the first three numbers is increased by 2 and each of the remaining three numbers is decreased by 4, then the new average is

a) 34

b) 31

c) 35

d) 30

Question : 6

The average of marks of 28 students in Mathematics was 50; 8 students left the school, then this average increased by 5. What is the average of marks obtained by the students who left the school ?

a) 37.5

b) 42.5

c) 50.5

d) 45