The marks in a su

a) Range = highest marks–lowest marks

= 42–17

= 25

b) Mean =

Sum of values = 31 + 37 + 35 + 38 + 42 + 23 + 17 + 18 + 35 + 5 + 35 + 29

= 345

Number of values = 12

Mean = = 28.75

c) Median

1^st arrange data in ascending order

17, 18, 23, 25, 29, 31, 35, 35, 35, 37, 38, 42

For even number of terms

Median = mean of and term

Median = mean of 6^th and 7^th term

= = 33

d) Mode

It is the marks which is obtained by maximum students

Mode = 35 (Comes for 3 students)