MCQ
Identify the INCORRECT statement about mercury battery.
- AIt consists of zinc anode, amalgamated with mercury.
- BIt has longer life than dry cell.
- CIt is used in hearing aids, electric watches, pacemakers, etc.
- ✓It is a primary dry cell.
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| X | 1 | 2 | 3 | 4 |
| P(X) | `1/3` | `2/9` | `1/3` | `1/9` |
1hen, the mean of this distribution is ______