The mean weight of 34 students of a school is 42 kg. If the weight of the teacher be included, the mean rises by 400 g. Find the weight (in kg) of the teacher?
Explanation:
Let the weight of the teacher be ‘x’ kgs.
⇒ New average = 42.4 = (34 × 42 + x)/35
⇒ 1484 = 1428 + x
⇒ x = 56
Hence, option (b).
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