Question 1

What is the mean?

Accepted Answer

The mean (arithmetic average) is the sum of all values divided by the count. Formula: Mean = Σx / n. It is sensitive to outliers.

Question 2

What is the median?

Accepted Answer

The median is the middle value when data is sorted. For an even count, it is the average of the two middle values. The median is resistant to outliers.

Question 3

What is the mode?

Accepted Answer

The mode is the value that appears most frequently. A dataset can have no mode (all values unique), one mode (unimodal), or multiple modes (bimodal, multimodal).

Question 4

What is standard deviation?

Accepted Answer

Standard deviation measures how spread out the numbers are from the mean. A low SD means values are close to the mean; a high SD means they are spread wide. Formula: σ = √(Σ(x−mean)² / n).

Question 5

When should I use median instead of mean?

Accepted Answer

Use the median when your data has outliers or is skewed (e.g., income data). The mean is pulled toward extreme values, while the median is not.

Question 6

What is the range?

Accepted Answer

The range is the difference between the maximum and minimum values: Range = max − min. It gives a quick measure of the spread of the data.

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What is the mean?

What is the median?

What is the mode?

What is standard deviation?

When should I use median instead of mean?

What is the range?

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