Find the mode of the following data.
20,3,7,13,3,4,6,7,19,15,7,18,3

Find the mode of the following data. 2,2,2,3,3,3,4,4,4,5,5,5,6,6,6.

Find the mode of the following data. 5,6,9,10,6,12,3,6,11,10,4,6,7

Find the mean deviation about the mean for the following data : 12, 3, 18, 17, 4, 9, 17, 19, 20, 15, 8, 17, 2, 3, 16, 11, 3, 1, 0, 5

Find the 19^(th) term of the following A.P. 7, 13, 19, 25, ….

Find the standard deviation of the following data 18,20,15,12,25.

Find the mean deviation about the median for the following data: 3, 9, 5, 3, 12, 10, 18, 4, 7, 19, 21.

Find the mean deviation about the mean for the following data: 6, 7, 10, 12, 13, 4, 8, 12