Question

The marks of three students P, Q, and R of a class are in the ratio 19:16:20.The marks of students P, Q, R are increased by 75%,20%,and 30% respectively. The total marks of the students increased by?​

Answer 1

Step-by-step explanation:

The obtained marks by 15 students arranging in ascending order,

03,07,08,09,11,11,12,13,14,16,17,19,20,23,24

(i)  Mean=1503+07+08+09+11+11+12+13+14+16+17+19+20+23+24

                    =15207

                    =13.8

(ii)   The new marks after increasing each student mark by 4  are,

07,11,12,13,15,15,16,17,18,20,21,23,24,27,28

Mean=1507+11+12+13+15+15+16+17+18+20+21+23+24+27+28

 

            =15267

            =17.8