Directions: Read the following and answer the questions that follow.
There are 3 classes having 20, 25 and 30 students respectively having average marks in an examination as 20, 25 and 30 respectively. If the three classes are represented by A, B and C and you have the following information above the three cases, answer the questions that follow:
A’s highest score 22, Lowest score 18
B’s highest score 31, Lowest score 23
C’s highest score 33, Lowest score 26
If five students are transferred from A to B.
Present total marks of Group A = 20 × 20 = 400
Highest score of Group A = 22
Total marks of 5 students of Group A = 22 × 5 = 110
New total marks = 400 - 110 = 290
∴ New average = $(\frac{{290}}{{15}} = 19.33)$
Hence, 19.33 is the new average.