Mathematics
The following table gives the duration of movies in minutes.
| Duration (in minutes) | No. of movies |
|---|---|
| 100-110 | 5 |
| 110-120 | 10 |
| 120-130 | 17 |
| 130-140 | 8 |
| 140-150 | 6 |
| 150-160 | 4 |
Using step–deviation method, find the mean duration of the movies.
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