1.

Arithmetic mean of the following series is 20.5 Marks 10 15 20 x 30 35 No. of Students 4 6 10 5 3 2 Find the missing item.

Answer»

Midpoint (X) No. of students (f) fx0−1010−2020−3030−4040−5050−60 51525354555 51025302010 251506251050900550∑f=100 ∑f(x)=3300x = ∑f∑f(x) = 1003300 =33∴ MEAN =33Explanation:MARK me the BRAINLIST



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