MathematicsMedium89×since 2002Q5490Let the median and the mean deviation about the median of 7 observation 170,125,230,190,210170,125,230,190,210170,125,230,190,210, a, b be 170 and 2057\frac{205}{7}7205 respectively. Then the mean deviation about the mean of these 7 observations is :A31B28C30D32Check answerSkip