Teaching Bihar STET Paper 1 (माध्यमिक) Mock Test 2024 Quantitative Aptitude Elementary Statistics

The mean of 21 observation is 42. If out of 21 given observations, the mean of the first 11 observation is 50 and the mean of the last 11 observations is 35, then the 11th observation will be:

1
50
2
40
3
35
4
53
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