RRB NTPC CBT I 16 Jan 2021 Shift 1 Paper
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Question : 30 of 100
Marks:
+1,
-0
Find the mean of the following data:
| x : | 19 | 21 | 23 | 25 | 27 | 29 | 31 |
| f : | 13 | 15 | 16 | 18 | 16 | 15 | 13 |
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