total no. of children = 40
∴ the median is the mean of marks of 20th and 21st child.
both lies in the range of 20-30.
let’s assume a uniform distribution of marks.
i.e., 14th child has 20 marks and 15th child has 20 + marks.
⇒ marks of 15th child =
⇒ marks of 20th child =
⇒ marks of 20th child = 25
also, marks of 21st child =
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