the mean of 20 observations is 12.5 by an error one observation is registered as -15 instead of 15 the correct mean is
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Mean = sumof all observations\no of observation
12.5=sum of 14 observation +15/15
187.5 -15=172.5
Instead as -15
172.5-15=157.5
Current mean =157.5
Step-by-step explanation:
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