A student's grades were submitted incorrectly as 83 instead of 63. As a result, the class's average grade increased by half (1/2). The following is the total number of students in the class:
A. 10
B. 20
C. 40
D. 73
Answer:C
A student's grades were submitted incorrectly as 83 instead of 63. As a result, the class's average grade increased by half (1/2). The following is the total number of students in the class:
A. 10 B. 20 C. 40 D. 73
Explanation: Let's say there are x students in the class.Total improvement in grades = x x 1/2 = x/2,x/2 = (83 - 63) = x/2 = 20 x= 40.