The mean marks of 20 students in Physics is 45. If each student was given additional 10 marks, the mean marks of 20 students will be:
45.5
50.5
55
52.5
Mean increases by 10.
In a classroom of 20 students, a physics test was conducted. The test was of 50 marks and the marks obtained by students are as follows
MarksFrequency304255456472481491501
Calculate the mean for the given set of data.
The marks obtained by 12 students in a mathematics examination are given below.
48, 78, 93, 90, 66, 54, 83, 58, 60, 75, 89, 84.
Find (i) the mean of the marks; (ii) the mean mark of the students if each student is given 4 grace marks.