Average - Questions and Answers

26. The average of 50 numbers is 38. If two numbers, namely 45 and 55

27. The average height of 30 girls out of a class of 40 is 160 cms, and that of the remaining girls is 156 cms. The average height of the whole class is :

28. The average of first nine multiples of 3 is :

29. Out of four numbers, the average of first three is 15 and that of the last three is 16. If the last number is 19, the first is :

30. The average of 8 numbers is 21. If each of the numbers is multiplied by 8, the average of the new set of numbers is :