Wipro Company Numerical Ability Averages

The average of 11 observations is 60. If the average of first five observations is 58 and that of the last five is 56, then the sixth observation is :

a. 90
b. 110
c. 85
d. 100

Read Solution (Total 1)

Let the 6th observation be x.
According to the question,
Total = 11 * 60 -----(i)
Total of first five = 58 * 5 ---(ii)
Total of Last five = 56 * 5 ---(iii)
Now, 58 * 5 + 56 * 5 + x = 660.
=> 114 * 5 + x = 660.
=> x = 660 - 570 = 90.
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Wipro Other Question

The average of six numbers is 30. If the average of first four is 25 and that of last three is 35, the fourth number is :

a. 25
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c. 35
d. 40 In seven given numbers, the average of first four numbers is 4 and that of the last four numbers is also 4. If the average of these seven numbers is 3, the fourth number is :

a. 3
b. 4
c. 7
d. 11