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The modal height and range of heights 1.35, 1.25, 1.35, 1.40, 1.35, 1.45, 1.50, 1.35, 1.50 and 1.20, are m and r respectively. Find m + 2r.
Find the value of t if the standard deviation of 2t, 3t, 4t, 5t and 6t is ?2.
In how many ways can 6 coloured chalks be arranged if 2 are of the same colour?
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