| Marks | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
| No of students | 5 | 7 | 9 | 6 | 3 | 6 | 4 |
The table above shows the distribution of marks by some candidates in a test. Find, correct to one decimal place, the mean of the distribution.
5.5
5.3
5.2
4.7
Correct answer is D
| Marks(x | 2 | 3 | 4 | 5 | 6 | 7 | 8 | Total |
| Frequency f | 5 | 7 | 9 | 6 | 3 | 6 | 4 | 40 |
| fx | 10 | 21 | 36 | 30 | 18 | 42 | 32 | 189 |
Mean ˉx=∑fx∑f=18940
= 4.725≊
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