A library has an average number of 510 visitors on sunday and 240 on other days. The average number of visitors per day …

The average marks of 14 students was 71. It was later found that the marks of one of the student has been wrongly enter…

The mean of the first ten even natural number is-

In Arun's opinion, his weight is greater than 65 kg but less than 72 kg. His brother does not agree with Arun and he thi…

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

From a class of 42 boys, a boy aged 10 years goes away and in his place, a new boy is admitted. If on account of this ch…

The average of 20 numbers is zero. Of them, at the most, how many may be greater than zero?

Nine persons went to a hotel for taking their meals. Eight of them spent Rs.12 each on their meals and the ninth spent R…