Find the mean from the following table ( rounded off to two decimals places. )
| Score | Frequencies |
| 15 | 2 |
| 18 | 3 |
| 21 | 4 |
| 22 | 1 |
| 19 | 5 |
| 23 | 1 |
| 24 | 2 |
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. 19.78.
Sum of Frequencies= 2 + 3 + 4 + 1 + 5 + 1 + 2 = 18
Sum Of (score × Frequencies )=(15 × 2) + (18 × 3) + (21 × 4) + (22 × 1) + (19 × 5
) + ( 23 × 1) + (24 × 2 ) = 356
⇒ Mean = 356/18 = 19.78