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Ifmissing frequency (f1 , f2):frequency5the mean of the following frequency distribution is 65.6, find thewhere fi 50.10-30 30-50 50-70 70-90 90-110 110-130f1 208f2220ht 1d cm is in the form |
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Answer» 10-30. 5. 20. 10030-50. 8. 40. 32050-70. f1. 60. 60f170-90. 20. 80. 1600 90-110. f2. 100. 100f2110-130. 2. 120 240________________________________submission of Fi=35+f1+f2------------(1) submission of fixi=2260+60f1+100f2mean=65.6fixi/fi= 65.62260+60f1+100f2/50 = 65.660f1+100f2=1020divide by 203f1+5f2=51-----------------(2)solving (1) and (2) by eliminationmultiply by 3 in (1)3f1+3f2 =453f1+5f2 =51-2f2=-6f2=3put in (1) f2=3f1=12 |
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