For a sample of 15 resistors

MATHEMATICS · Multi-part · CBSE · Mathematics · Statistics · Statistics

Problem

For a sample of 15 resistors, the sum of their resistances is 1800 Ω. The variance of the resistances is known to be 16 Ω². (i) Find the mean resistance of the sample. (ii) Determine the sum of the squares of the resistances of the 15 resistors.

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