Question

An sss1 contains three classes of 36,33 and 31 students. in an examination, the average mark of the classes were 65,56 and 52 respectively. what was the average mark for the sss1 altogether solve

Answer 1

Average mark for the SSS1 altogether = (36 x 65 + 33 x 56 + 31 x 52) / (36 + 33 + 31)
= (2340 + 1848 + 1612) / 100
= 58.00