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Illustration Years 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 Diagrammatic and Graphic Presentation Sales 3158 65 75 80 72 196 83 98 laki) Cost of Sales / 42 1 Rs. In 50 48 55 82 75 62 80 67 .73 Lakh) Profit Loss -11 +8 +10 - 7 +10 +20 +16 125 Solution : The given data comprises of three variables, so, we have to draw a separate curve for each variable. In this graph, it is not necessary to draw false base line because the minimum value is close to the point of origin (zero). For casy identification, each curve is marked differently. -Sales Cost of Sales -Profit & Loss 1001 80 60 Sales, Cost of Sales and Profit&loss (Rs.in lakhs) 40 20 0 1996 1997 1998 1999 2000 1991 1993 1994 1995 -20 1992 Years Figure 7.10 : Historigram Showing Sales, Cost of Sales and Profit Loss of a Company During 1991-2000 The above graph clearly reveals that with passage of time the profits are rising after 1996, even though the sales are fluctuating slightly. ug and Presentation 100 90 80- 70- Histogram 60 50 No. of companies -Frequency Polygan 40 30 20 10 - 0 10 20 30 422 46.67 50 60 70 80 Sale of computers (Rs. in crores) Figure 7.11: Histogram and Frequency Polygon for Computer Sales of Various Companies Remark: The calculation of Mode will be discussed in Unit 8 of this block. Self Assessment Exercise H The monthly production of units by a sample of 200 workers in a bulbs manufacturing firm is given in the following table. 200 225 225- 250 250- 275 275- 300 300- 325 325- 350 350- 375 375- 400 Output (Units) No. of Workers 12 21 25 40 49 28 17 8 1) Draw a historgram and frequency polygon. ii) Determine the mode graphically. enel the data and show the ettely growth Crap, NNp. ronounce