The average of a collection of 20 measurements was calculated to tb 56 cm. But later it was found that a mistake had occ…

4 boys and 3 girls spent Rs. 120 on an average, of which boys spent Rs. 150 on the average. The the average amount spent…

If the mean of a, b, c, is M and ab + bc + ca = 0, then the mean of a<sup>2</sup>, b<sup>2</sup>…

The average of x numbers is y<sup>2</sup> and the average of y numbers is x<sup>2</sup>. So, th…

The average of runs of a cricket player of 10 innings was 32. How many runs must he make in his next innings so as to in…

The average temperature on Wednesday, Thursday and Friday was 25°. The average temperature on Thursday, Friday and S…

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 of the first 100 positive integers is -