Question

the mean of the marks scored by 12 students of a class is 67.4.if the mean of another class consisting of 15 students is 72.3,find their combined mean​

Answer 1

Step-by-step explanation:

{(67.4×12)+(72.3×15)}÷(12+15)

{808.8+1084.5}÷27

1893.3÷27

70.12222 is your answer [:-)

Answer 2

Answer:

70.12

Step-by-step explanation:

the mean of the marks scored by 12 students of a class is 67.4

=> Number of students = 12

& Mean Marks = 67.4

Total Marks by class = number of students * Mean Marks

=> Total Marks by class = 12 * 67.4 = 808.8

mean of another class consisting of 15 students is 72.3

=> Number of students = 15

& Mean Marks = 72.3

=> Total Marks by another class = 15 * 72.3 = 1084.5

Total Students in both Classes = 12 + 15 = 27

Total Marks by both classes = 808.8 + 1084.5  = 1893.3

Combined Mean = 1893.3 / 27   =  70.12