state gov UPSSSC Forest Guard Mock Test 2023 Mathematics Statistics Measures of Central Tendency

The number of observations in a group is 40. If the average of first 10 is 4.5 and that of the remaining 30 is 3.5, then the average of the whole group is 

1
\(\frac{1}{5}\)
2
\(\frac{{15}}{4}\)
3
4
4
8
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