Question

find the class mark of the swcond class intervals 1-10,11-20,21-30

Answer 1

Class mark= (upper limit+ lower limit)/2 So class mark=11+20/2 =31/2=15.5 So 15.5 is the class mark Hope it helps

Answer 2

Class mark is upper limit + lower limit / 2 So...the second class interval is 11-20...20 is d upper limit n 11 is d lower limit...thus (20 + 11) /2 Therefore 31/2..thus 15.5 is d class mark......