Question
Fill in the blanks:
For any event E, P(E) + P(not E) = _____.
For any event E, P(E) + P(not E) = _____.
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| Class | 0-15 | 15-30 | 30-45 | 45-60 | 60-75 | 75-90 |
| Frequency | 8 | 7 | 12 | 5 | 3 | 12 |