Question

The average mark of 19 children is 50.when a new student with marks 75 join class. Find average.

Answer 1

Answer:

51.25

Step-by-step explanation:

Step 1) Take the difference between the old average and the new marks = 75-50=25

Step 2) This score of 25 is distributed over 20 students => 25/20 = 1.25

Step 3) Hence, the average increases by 1.25=> 50+1.25 = 51.25.