the mean weight of 150 students in a certain class is 60kg. The mean weight of boys is 70kg and that of girls is 55kg. Find the number of boys and the girls in the class
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Step-by-step explanation:
X X ¯ 1 = Mean weight of boy = 70 kgs. X X ¯ 2 = Mean weight of girl = 55 kgs. X = Mean weight of all students = 60 kgs. ⇒ n1 = 50
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