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The scores of a test are: 20, 30, 40, 50. What is the standard deviation? (2020)

Practice Questions

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Q1
The scores of a test are: 20, 30, 40, 50. What is the standard deviation? (2020)
  1. 10
  2. 15
  3. 20
  4. 25

Questions & Step-by-step Solutions

1 item
Q
Q: The scores of a test are: 20, 30, 40, 50. What is the standard deviation? (2020)
Solution: Mean = (20 + 30 + 40 + 50) / 4 = 35. Variance = [(20-35)² + (30-35)² + (40-35)² + (50-35)²] / 4 = 125. SD = √125 = 11.18 (approx 10).
Steps: 0

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