# Find the variance of the data…

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Find the variance of the data

• A. 4.69
• B. 3.42
• C. 4.85
• D. 3.72

D

## SOLUTION…

Variance = average of the squared difference between each score and the mean score.

Hence, variance = 171/46 = 3.72

### Now for the right answer to the above question:

1. Option A is incorrect.
2. Option B is incorrect.
3. C is incorrect.
4. D is the correct answer.

## QUICK TIPS…

• Variance is the average of the square of the deviation of each score from the mean.
• To calculate variance:
• We firstly find the mean,
• Then subtract each score from the mean, and
• Then square each of the answers gotten, and
• Then multiply each of the squares with the corresponding frequency, and
• Then sum them up, and
• Finally divide this sum with the total frequency to get the variance.
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