the mean of 20 observation is 15 .if two observation 3 and 4 are reapaced by 8 and 9 respectively. then what will be the new mean ( dont spam give step wise answer
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Step-by-step explanation:
Mean of 20 observations = 15
∴ Sum of 20 observations = 15×20=300
Replacing 3 and 14 by 8 and
9 will mean that 3 + 14= 17 is replaced by 8 + 9 = 17.
Hence there will be no effect on the sum. It will still remain 300, so the mean will not change and will remain 15.
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