The mean of the numbers \( a, b, 8,5,10 \) is 6 and their
\( \mathr...
The mean of the numbers \( a, b, 8,5,10 \) is 6 and their
\( \mathrm{P} \) variance is 6.8 . If \( M \) is the mean deviation of the
W numbers about the mean, then \( 25 M \) is equal to:
(1) 60
(2) 55
(3) 50
(4) 45
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