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Illustration- Years 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 Diagrammate and Graphic Presentation 3158 42 65 75 80 72% 83 98 Sales int lakh) Cost of Sales 42 50 Rs. In Lakh) 48 55 82 75 2 - 67 .73 Profil -11 +8 -6 +10 --7 +5 Loss +10 +20 +16 +25 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 draw false base line because the minimum value is close to the point of origin (zero). For easy identification, each curve is marked differently. Sales Y 100 Cost of Sales -Profit & Loss 80 60 - Sales, Cost of Sales and Profit & loss (Rs.in lakhs) 40 20 1995 1996 1997 1999 2000 1994 1998 1993 1992 -20 1991 Years Figure 7.10 : Historigram Showing Sales, Cost of Sales and Profil 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 42-48.67 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. Output (Units) 200- 225 12 225 250 250- 275 275- 300 300 325 325- 350 350 375 375- 400 No. of 21 25 40 49 28 17 8 Workers 1) Draw a historgram and frequency polygon. i) Determine the mode graphically. Represent the the falliving dan usi enel and show the effects on se using econome growth Gap, NNp