Find the missing frequency in the following distribution if the mean marks are

MATHEMATICS · Single correct · CBSE · Mathematics · Statistics · Statistics

Problem

Find the missing frequency in the following distribution if the mean marks are 3030. Class interval (marks): 10–20 20–30 30–40 40–50 Frequency:      6    8    ?    6 (a) 1010 (b) 66 (c) 88 (d) 1212

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