1) The average of the numbers 45, 60, x and 70 is 65. Calculate the value of x.
2) 320 , 150, 270, 60. Calculate the average of this number.
3) The average scores of 4 pupils in a test is 85. First pupil scored 65 and
the second is 75. If the third and fourth pupils scores are same. Calculate
the score of the fourth pupil.
4) 3.2, 5.1, 3.4, 12.3 . Calculate the average of this number.
5) The average scores 0f 6 pupils in a test is 70. The average scores of 5 pupils
is 68. Find the score of the fifth pupil.
Answer : 1) 85 2) 200 3) 100 4) 6 5) 80