If the mean deviation of the numbers $1$, $1+\mathrm{d}$, $1 +2\mathrm{d},\ \ldots$ , $1+100\mathrm{d}$ from their mean is $255$, then the $\mathrm{d}$ is equal to
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If the mean deviation of the numbers $1$, $1+\mathrm{d}$, $1 +2\mathrm{d},\ \ldots$ , $1+100\mathrm{d}$ from their mean is $255$, then the $\mathrm{d}$ is equal to