Maths The mean of 20 trials is 18 and that of the first 9 is 14. If the mean of the last 9 is 17, then the mean of the middle two numbers will be?
| Q.201274: The mean of 20 trials is 18 and that of the first 9 is 14. If the mean of the last 9 is 17, then the mean of the middle two numbers will be? |
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