Find the range of the following data: 26, 21, 33, 17, 14, 15, 27

Q. Find the Karl Pearson's co-efficient of correlation between $x$ and $y$ for the following data:

$x$	$16$	$18$	$21$	$20$	$22$	$26$	$27$	$15$
$y$	$22$	$25$	$24$	$26$	$25$	$30$	$33$	$14$

Q. The marks of a class test are given below.
$28,26,17,12,14,19,27,26,21,16,15$. Find the median.

Q. Find the mode of the data.
$14,6,9,15,14,9,21,21,25,21,27,29,21,8,6,$

Q. Taking 4 as the magnitude of the class intervals, form a grouped frequency distribution using the following data by inclusive method.



31, 23, 19, 29, 22, 20, 16, 10, 13, 34
38, 33, 28, 21, 15, 18, 36, 24, 18, 15
12, 30, 27, 23, 20, 17, 14, 32, 26, 25
18, 29, 24, 19, 16, 11, 22, 15, 17, 10

Q. The marks obtained by twenty students are given as follows.
$27,22,24,17,16,15,14,22,17,15,22,26,19,22,20,22,16,15,22,27$
Find the modal marks.