Three sections of a class have respectively 25,50,25 students. The mean marks obtained by the first two sections are respectively 60 and 55. The overall mean of all three sections is 58. The mean of the third section is
A. 52
B. 57
C. 58
D. 62
Answer:D
Three sections of a class have respectively 25,50,25 students. The mean marks obtained by the first two sections are respectively 60 and 55. The overall mean of all three sections is 58. The mean of the third section is
A. 52 B. 57 C. 58 D. 62