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Which of the following of a random variable is a measure of spread?

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Which of the following of a random variable is a measure of spread?

(a) variance

(b) standard deviation

(c) empirical mean

(d) all of the mentioned

I got this question in my homework.

This interesting question is from Probability and Statistics topic in section Statistical Inference and Regression Models of Data Science

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Best answer
Right option is (a) variance

The explanation is: Densities with a higher variance are more spread out than densities with a lower variance.

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