IAI Actuarial Core Principles · Actuarial Statistics · Exploratory data analysis
For 20 policies, the sum of claim amounts is Rs 400 thousand and the sum of squares of claims is 9,800 (Rs thousand squared). What is the sample variance?
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- A50.0
- B52.6Correct
- C58.9
- D400.0
- 490.0
Explanation
Mean = 20. Sxx = 9,800 - 20*400 = 9,800 - 8,000 = 1,800. Variance = 1,800/19 = 94.7. This is not among the options, so the data are inconsistent.
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