Mathematics
The following table gives the life time in days of 100 electricity tubes of a certain make :
| Lifetime in days | No. of tubes |
|---|---|
| less than 50 | 8 |
| less than 100 | 23 |
| less than 150 | 55 |
| less than 200 | 81 |
| less than 250 | 93 |
| less than 300 | 100 |
Find the mean lifetime of electricity tubes.
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