Let the median and the mean deviation about the median of 7 obser… | JEE Main 2024 Mathematics PYQ

MCQMediumJEE Main 2024 · 1 February, Shift 1Measures of Dispersion

Let the median and the mean deviation about the median of $7$ observations $170$ , $125$ , $230$ , $190$ , $210$ , $a$ , $b$ be $170$ and $\frac{205}{7}$ respectively. Then the mean deviation about the mean of these $7$ observations is:

A
$31$
B
$28$
C
$30$
D
$32$

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