9th Grade Variance Quizzes , Questions & Answers

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9th Grade

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Variance Calculation Quiz: Calculating Variance (Basic Level)

Ever wondered how far numbers drift from their average? This quiz walks you through basic variance problems that show how spread works within a data set. You’ll compare values, measure deviations, and see how variance...

Questions: 20 | Attempts: 30 | Last updated: May 7, 2026

Sample Question 1
What is the population variance of the data set {2, 4, 6, 8, 10}?

6

7

8

9

Sample Question 2
What is the sample variance of the data set {6, 8, 10}?

1

2

3

4

Sample Population Variance Quiz: Sample vs. Population Variance

Can you tell when to use sample variance and when to use population variance? This quiz helps you sort out the difference through clear, practical scenarios. You’ll practice choosing the right formula, comparing...

Questions: 20 | Attempts: 13 | Last updated: May 11, 2026

Sample Question 1
Which of the following is the correct formula for population variance?

S² = Σ(x − x̄)² ÷ n

S² = Σ(x − x̄)² ÷ (n − 1)

σ² = Σ(x − μ)² ÷ N

σ² = Σ(x − μ)² ÷ (N − 1)

Sample Question 2
Which of the following is the correct formula for sample variance?

σ² = Σ(x − μ)² ÷ N

σ² = Σ(x − μ)² ÷ (N − 1)

S² = Σ(x − x̄)² ÷ n

S² = Σ(x − x̄)² ÷ (n − 1)

Recent Variance Quizzes

Understanding Variance as a Measure of Spread

In this quiz, you're diving into the world of variance, which is like a "spread check" for your data. It tells you how scattered or consistent your data points are around the average. By walking through the...

Questions: 21 | Attempts: 15 | Last updated: Jan 22, 2026

Sample Question
What does variance measure in a data set?

The middle value of the data

The most frequently occurring value

How spread out the data values are from the mean

The difference between the maximum and minimum values