The marks of six boys in a group are 48, 59, 87, 37, 78 and 57. What are the average marks of all six boys? (a) 61      (b) 65     (c) 69     (d) None of these

The marks of six boys in a group are 48,59 ,87,37,78 and 57. What are the average marks of all six boys? (a) 61 None of these

The body weight of six boys is recorded as 54 kg,64 kg,75kg,67kg,45kg and 91kg. What is the average body weight of all six boys?

The boy weight of six men is recorded as 69kg, 87kg, 96 kg, 85 kg, 48 kg, and 83 kg. What is the average body weight of all the six men ?

The average of 80 boys in a class is 15. The average age of a group of 15 boys in the class is 16 and the average age of another 25 boys in the class is 14. What is the average age of the remaining boys in the class? (a) 14 (b) 14.75 (c) 15.25 (d) Cannot be determined (e) None of these

The body weight of seven boys is recorded as 67 kg, 45 kg, 87 kg. 65 kg. 86 kg, 54 kg and 58 kg. What is the average body weight of all seven boys ?

The average marks in Science subject of a class of 20 students is 68. If the marks of two students were misread as 48 and 65 instead of the actual marks 72 and 61 respectively, what would be the correct average? (a) 66 (b) 68.5 (c) 69 (d) 69.5 (e) 70

A coaching institute has students in 3 batches – X, Y and Z. In a certain examination, the average marks obtained by these batches are 72, 60 and 50 respectively. The average marks of batches X and Y taken together is 69. If the ratio of the number of students in batches Y and Z is 6 : 7, what is the average score of all the three batches put together? (a) 59 (b) 61.6 (c) 63.5 (d) 64.7 (e) 65