SOLUTION: in physics examination the mean mark for the first 12 students is 60, that of the next 20 students is 50 and that of the remain y student is x. what is the mean mark for the whole

Question 999055: in physics examination the mean mark for the first 12 students is 60, that of the next 20 students is 50 and that of the remain y student is x. what is the mean mark for the whole class in the exam in terms of x and y
Answer by fractalier(6550) (Show Source): You can put this solution on YOUR website!
The mean in this case divides the total points by the total number of students.
Here the total points are 12(60) + 20(50) + y(x) = 1720 + xy
The total number of students is 12 + 20 + y = 32 + y
So that the mean is the quotient

RELATED QUESTIONS
in a statistics examination, the mean mark of the first twelve students in a class is... (answered by rothauserc)

The marks obtained by students in a mathematics test had an unknown mean and standard... (answered by stanbon)

Class of 20 students merged with class of 20 students. The average mark at a test in the... (answered by ewatrrr)

In an examination the average mark for the first five students was 86 and of the first... (answered by Cromlix)

20% of students who sit for the CPA examination pass it the first time. Find the... (answered by stanbon)

In the examination of the class of 100 students, 50 students failed in Mathematics, 45... (answered by ikleyn)

In a class of 100 students, it is known that 45 study mathematics, 26 study chemistry and (answered by richwmiller)

Question 1 -The 112 students sat for an examination.Question 1 was answered by 50... (answered by ikleyn)

Out of 50 students, 18 study Biology, 26 study Physics, and 2 study Biology AND Physics. (answered by ikleyn)