The table above shows the scores of a group of 40 students in a physics test
What is the mean of the distribution?
A.
4.2
B.
4.5
C.
4.8
D.
5.0
E.
5.2
Correct answer is C
| x | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | Total |
| f | 2 | 3 | 6 | 7 | 9 | 6 | 2 | 2 | 3 | 40 |
| fx | 2 | 6 | 18 | 28 | 45 | 36 | 14 | 16 | 27 | 192 |
Mean = \(\frac{\sum fx}{\sum f}\)
= \(\frac{192}{40}\)
= 4.8