How do I approach Statistics & Math interview questions?

Statistics & Math questions require understanding of core concepts and practice. PracHub provides solutions with explanations to help you master statistics & math interviews.

What difficulty level is this interview question?

This is a easy difficulty Statistics & Math question, commonly asked during Onsite rounds at Glean.

What role is this question designed for?

This question is commonly asked for Data Scientist candidates at Glean during technical interviews.

What are sum expectation and variance? | Glean Interview Question

Q: What are sum expectation and variance?

This question evaluates understanding of expectation, variance and covariance and the ability to reason about how sums of random variables affect their moments, including the role of covariance and the special case of independence in the Statistics & Math domain.

Let random variables X and Y have finite means and variances. How do you compute:

The expectation of X + Y
The variance of X + Y

Your answer should state the general formulas, explain the role of covariance, and describe the special case when X and Y are independent.

What are sum expectation and variance?

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