The observations 4, 1, 4, 3, 6, 2, 1, 3, 4, 5, 1, 6 are outputs of 12 dices thrown simultaneously. If m and M are means of lowest 8 observations and highest 4 observations respectively, then what is (2m + M) equal to ?  

A bivariate data set contains only two points (-1, 1) and (3, 2). What will be the line of regression of y on x ?

A die is thrown 10 times and obtained the following outputs :

1, 2, 1, 1, 2, 1, 4, 6, 5, 4

 What will be the mode of data so obtained ?  

Consider the following frequency distribution :

x	1	2	3	5
f	4	6	9	7

What is the value of median of the distribution ?