FAQ: More on Probability Distributions - Variance of the Binomial Distribution

This community-built FAQ covers the “Variance of the Binomial Distribution” exercise from the lesson “More on Probability Distributions”.

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This exercise can be found in the following Codecademy content:

Master Statistics with Python


FAQs on the exercise Variance of the Binomial Distribution

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I’ve got a question for the “Variance of the Binomial Distribution” section in the “More on probability distributions” lesson:

Why is there an ‘&’ in the calculation of the variance? Is this a typo or is this part of how these calculations are written? If it’s not a typo, why is this included? Here is the text I’m referring to:

"We then multiply this variance for all 20 questions in the quiz and get: