The mode of data 3, 3, 4, 5, 3, 5, 6, 3, 7, 9, 11, 7

A data has 13 observations arranged in descending order. Which observation presents the median of the data ?

Which of the following is difficult to construct always ?

Under the usual notations the formula for calculating mode for grouped frequency distribution is

The mean of a + 1,a + 3,a + 4 and a + 8 is

If 5 is added to each and every item of a data, then the arithmetic mean is

The median of 24, 20, 32, 18, 28, 16, 25 is

For the data 9, 8, 7, 7, 6, 3, 7, 2, 1, 7, 9 the mode is

The arithmetic mean of 12, 15, 13, 20, 25 is

The width of the class in the distribution having class intervals 1 – 20, 21 – 40,41 – 60 is