Statisticshard · Past Paper
The mean of 10 observations is 15.7. If a new observation 19 is added, the new mean is:
A16
B15.8
C16.5
D16.2
✓ Correct Answer: A — 16
Old Sum = 10 * 15.7 = 157. New Sum = 157 + 19 = 176. New Mean = 176 / 11 = 16.
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