Ononot — In a survey, 'Non-response Bias' is defined as B = \frac{N{n

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In a survey, 'Non-response Bias' is defined as $B = \frac{N_{nr}}{N}(\bar{Y}_r - \bar{Y}_{nr})$ . If $N=1000$ , $N_{nr}=200$ , $\bar{Y}_r=50$ , and $\bar{Y}_{nr}=40$ , what is the bias $B$ ?