JEE Maths›Statistics›Visual Solutions

Visual Solutions

3 step-by-step animated solutions for Statistics. Each solution breaks the problem into visual clips with key insights.

Two groups of 20 and 30 students have means 50 and 60, and standard deviations 4 and 5 respectively. The variance of the combined group of 50 students is:

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If the mean and variance of eight numbers 3, 7, 9, 12, 14, 20,

x

y

are 10 and 25 respectively, then

x \cdot y

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Let the observations

x_i

1 \leq i \leq 10

\sum_{i=1}^{10}(x_i - 5) = 10

\sum_{i=1}^{10}(x_i - 5)^2 = 40

. Then the variance of

x_1, x_2, \ldots, x_{10}

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Sets, Relations & Functions

Mathematical Reasoning