Mathematics · Statistics and Probability
An online exam is attempted by 50 candidates, out of which 20 are boys. The average marks obtained by the boys is 12 with a variance of 2. The variance of marks obtained by the 30 girls is also 2. If the average marks of all 50 candidates combined is 15, and u is the average marks of the girls and σ2 is the combined variance of all 50 candidates, then u + σ2 is equal to:
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