JEE Advanced 2026 Mathematics question
Consider a data consisting of observations , whose mean is and variance is . If the mean and the variance of the first observations are and , respectively, and , then the value of is .
Answer: 44
Solution
From the observations,
=10×5=50, -=7\ ⇒\ =10(7+25)=320 .
From the first observations,
=8×4=32, -=3.5\ ⇒\
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