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The mean of 9 observations is 16. One more observation is included and the new mean becomes 17. The 10th observation is
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- 9
- 16
- 26
- 30
- 9
Correct Option: C
Tenth observation = Mean of Ten observations – Mean of nine observations
Tenth observation = 10 × 17 – 16 × 9
Tenth observation = 170 – 144 = 26
Second method to find the required average ,
Here, N = 9, T = 16 n = 1, t = 1
| 10th observation = T+ |  | + 1 |  | t | |
| n |
| 10th observation = 16 + | | + 1 | | × 1 | |
| 1 |
10th observation = 16 + 10 = 26
