Question : The average of the series 500, 505, 515, 530, 550 is:

Option 1: 520

Option 2: 515

Option 3: 505

Option 4: 530

Question : The average of T₁ and T₂ is 15. The average of T₃ and T₄ is 35. What is the average of T₁, T₂, T₃, and T₄?

Option 1: 24

Option 2: 30

Option 3: 28

Option 4: 25

Question : The average of a set of 15 numbers is 41. Five numbers 21, 24, 39, 47, and 97 are removed from the above set. What will the average of the remaining 10 numbers be?

Option 1: 39.2

Option 2: 37.6

Option 3: 38.7

Option 4: 36.4

Question : The average of a set of 15 consecutive even numbers is 64. What is the difference between the largest and the smallest numbers belonging to this set?

Option 1: 26

Option 2: 27

Option 3: 25

Option 4: 28

Question : The average mark scored by 8 boys is 72. If the scores of three girls are also included, the average marks increase by 3. The average marks scored by the three girls are:

Option 1: 95

Option 2: 83

Option 3: 78

Option 4: 68