Question

in a batch of 15 students 5 students failed in a test. the marks of 10 students who passed were 90, 60, 70, 80, 80, 90, 60, 50, 40, 70. find the median of the marks of all 15 students.

Answer 1

first arrange all 15 student marks in ascending order

the 5 students marks who failed are 0

0, 0, 0, 0, 0, 40, 50, 60, 60, 70, 70, 80, 80, 90, 90

now the median is 60

Answer 2

the marks of 5 students=0

median=0,0,0,0,0,90,60,70,80,80,90,60,50,40,70

median=odd

third observation =70

median=70