Teaching BPSC बिहार प्राथमिक (1 to 5) शिक्षक भर्ती 4.0 Mock Test Quantitative Aptitude Average

The average of a group of observations is 10. Find the value of 'x' if one observation 'x' is added and the mean remains unaltered.

1
12
2
15
3
10
4
More than one of the above
5
None of the above
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