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प्रश्न
The mean of 15 observations is 32. Find the resulting mean, if the observation is: Decreased by 20%
उत्तर
Given that the mean of 15 observations is 32
resulting mean decreased by 20%
= 32 - `( 20 ) / (100 ) xx 32 `
= 32 - 6.4
= 25.6
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