Teaching OSSC TGT Teachers Mock Test 2023 Quantitative Aptitude Elementary Statistics

If the arithmetic mean of 13 observations 217, 218, 220, 211, 219, 213, 215, X, 211, 219, 220, 214, 218 is 221. Find the value of "X" in the observations.

1

272

2

274

3

276

4

278

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