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Mean =sigmafixi/sigma fi
Sigma fixi=460+7p
Sigma fi=32
Given : Mean = 18.75
18.75 = (460 + 7p) / 32
18.75 × 32 = (460 + 7p)
600 = (460 + 7p)
7p = 600 - 460
7p = 140
p = 140/7
p = 20
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