The marks obtained by 17 students a mathematics test (out of 100) are given below: 90,79,76,82,65,96,100,91,82,100,49,46,64,48,72,66,68. Find the range of the above data.
Marks obtained by 5 students in a class test out of 25 are 12, 15, 12, 20, 17 respectively. Find the mode of given number of observations.