Mathematics
If each observation of the data is decreased by 15; then the mean :
remains same
is increased by 15
is decreased by 15
is multiplied by 15
Statistics
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Answer
According to property 3, if each observation of the data is decreased by a quantity a, the mean is also decreased by the same quantity a.
Therefore, when each observation of the data is decreased by 15, the mean is decreased by 15.
Hence, option 3 is the correct option.
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