The following table shows the number of working hours and the number of employees employed in a small scale industry<…

If the mean of 5 observations x, x + 2, x + 4, x + 6 and x + 8 is 11, then the mean of the last three observations is-

In a class there are 32 boys and 28 girls. The average age of the boys in the class is 14 years and the average age of t…

Of four numbers whose average is 60, the first is one-fourth of the sum of the last three. The first number is -

The average age of a husband and wife at the time of their marriage was 25 years. A son was born to them two years after…

The average age of a class of 39 students is 15 years. If the age of the teacher is included, then the average increases…

Out of nine persons, 8 persons spent Rs. 30 each for their meals. The ninth one spent Rs. 20 more than the average expen…

A batsman in his 12<sup>th</sup> innings makes a score of 63 runs and there by increases his average score b…