A grouped distribution has equal class width 10 as shown

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

Problem

A grouped distribution has equal class width 10 as shown. Class interval (marks): 30–40, 40–50, 50–60, 60–70, 70–80 Frequency: 5, 8, ff, 6, 3 If the mean of the distribution is 53, determine the missing frequency ff. (a) 77 (b) 99 (c) 88 (d) 66

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