Multiple choice

The mean of the following observation is $10, 19, 22, 16, 15, 18, 20, 18, 14, 18, 23$.

  1. $17.55$
  2. $18$
  3. $15$
  4. $16.5$
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A Correct answer
Explanation

Sum = 10+19+22+16+15+18+20+18+14+18+23 = 193. Count = 11. Mean = 193/11 = 17.5454...

AI explanation

Using the direct method for arithmetic mean, sum the observations: 10 + 19 + 22 + 16 + 15 + 18 + 20 + 18 + 14 + 18 + 23 equals 193. Divide this sum of 193 by the total of 11 observations to get the mean. The result is 17.545, which rounds to 17.55. The mean is 17.55.