Multiple choice

Find the variance among the scores of a group of students whose scores are 55, 57, 60, 50 and 52.

  1. 14.61

  2. 12.56

  3. 16.8

  4. 17.9
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Mean = (55+57+60+50+52)/5 = 274/5 = 54.8. Variance = [(55-54.8)^2 + (57-54.8)^2 + (60-54.8)^2 + (50-54.8)^2 + (52-54.8)^2] / 5 = [0.04 + 4.84 + 27.04 + 23.04 + 7.84] / 5 = 62.8 / 5 = 12.56.

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