With very little I know, calculating standard deviation

1. Count of Math Scores

:

Use the COUNT function to find the total number of math scores.

Example formula: =COUNT(A2:A100) (Assuming your math scores are in column A from rows 2 to 100).

2. Count of Math Scores (n-1):

Simply subtract 1 from the count you calculated.

Example formula: =COUNT(A2:A100) - 1.

3. Mean (x̄):

Use the AVERAGE function to find the mean of the math scores.

Example formula: =AVERAGE(A2:A100).

4. Σ(x - x̄)²:

You will need to calculate the squared differences. In a new column (let's say column B), use the formula:

=(A2 - $C$1)^2 (assuming C1 contains the mean).

Drag this formula down to apply it to all scores.

Then use the SUM function to sum the squared differences.

Example formula: =SUM(B2:B100).

5. Σ(x - x̄)² / (n-1):

Divide the sum of squared differences by n−1n−1.

Example formula: =SUM(B2:B100) / (COUNT(A2:A100) - 1).

6. Square Root of Σ(x - x̄)² / (n-1):

Use the SQRT function to find the square root.

Example formula: =SQRT(SUM(B2:B100) / (COUNT(A2:A100) - 1)).

7. Standard Deviation Function =STDEV.S:

You can use Excel's built-in standard deviation function as a check.

Example formula: =STDEV.S(A2:A100).