The average monthly salary of 12 workers and 3 managers in a factory was Rs. 600. When one of the manager whose salary w…

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

Average of ten positive numbers is $$\overline x $$. If each number is increased by 10%, then $$\overline x $$ -

While calculating the average of a batsman as 36 in 100 matches that he played, one of the scores 90 was incorrectly not…

The average weight of 3 men, A, B and C is 84 kg. Another man D joins the group and the average now becomes 80 kg. If an…

A car owner buys petrol at Rs.7.50, Rs. 8 and Rs. 8.50 per litre for three successive years. What approximately is the a…

The average weight of 12 parcels is 1.8 kg. Addition of another new parcel reduces the average weight by 50 gm. What is …

If average of 20 observations x<sub>1</sub>, x<sub>2</sub>, . . . . . x<sub>20</sub>…