The mean of 25 observations is 36. If the mean of the first 13 observations is 32 and that of the last 13 observations is 39, then the 13th observation is:
Question and options
The mean of 25 observations is 36. If the mean of the first 13 observations is 32 and that of the last 13 observations is 39, then the 13th observation is:
- 16
- 23
- 21
- 18
Answer and explanation
Correct answer: B - 23
Total = 25*36 = 900. First 13 sum = 416 and last 13 sum = 507; together they count the 13th observation twice: 923 - 900 = 23.
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