The mean of 100 observations is 40. It is found that an observation 53 was misread as 83. Find the correct mean.

Find the mean of 43, 51, 50, 57 and 54.

The mean marks (out of 100) of boys and girls in an examination are 70 and 73 respectively. If the mean marks of all the students in that examination is 71, find the ratio of the number of boys to the number of girls.

The mean of 15 observations is 32. Find the resulting mean, if each observation is Multiplied by 2

Find the mean of x + 3, x + 5, x + 7, x + 9 and x + 11.

Find the mean of first ten odd natural number.

The mean of 200 items was 50. Later on, it was discovered that two items were misread as 92 and 8 instead of 192 and 88. Find the correct mean.

In 10 numbers, arranged in increasing order, the 7th number is increased by 8, how much will the median be changed?

Find the median of 25, 16, 26, 16, 32, 31, 19, 28 and 35