1.

Findthe mean and mode for the following data:Classes |Frequency410 20 20-30 30-40 40 50 50 60 60-70 70-801012 104

Answer»

Mode = l1 + (f1-f0) ------------ ×h (2f1 -f0-f2)

= 40 + (12-10)(10) -------------------- (24-10-10) = 40 + 5 = 45

CI. f. x. xf10-20 4 15. 6020-30 8 25. 20030-40 10 35. 35040-50 12 45. 54050-60 10 55. 55060-70 4 65. 26070-80 2 76. 152summation of xf= 2112summation of f=50mean = 2112/50=42.24



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