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af Fat 5 7, >A Dh, =7(%-a), , , , Therefore, (, , Substituting the values of a, > Siui , yy, fi and h from the table,, We get, x =475+[2] x 15, =47.5+14.5, = 62., So, the mean marks obtained by a student are 62, The method discussed above is called the Step-deviation method., , Worksheet, , 1. Thirty women were examined in a hospital by a doctor and their heart beats per, minute were recorded and summarised as shown. Find the mean heart beats per, , minute for these women, choosing a suitable method., , , , Number of 65-68 | 68-71 | 71-74 | 74-77 | 77-80 | 80-83 | 83-86, heart beats/, , minutes., , Number of 2 4 3 8 7 4 2, women, , , , , , . Ina retail market, fruit vendors were selling oranges kept in packing baskets. These, , baskets contained varying number of oranges. The following was the distribution of, oranges., , , , Number of oranges | 10-14 | 15-19 | 20-24 [25-29 [30-34, , , , Number of baskets | 15 110, , 135 [is [2s, , , , , , Find the mean number of oranges kept in each basket. Which method of finding the mean did you, , choose?, , , , Instructions, 1. See page no.331 to 334., 2. Solve Exercise 14.1., , , , What I have learnt Perfectly, , Partially Can’t do, , , , 1. I can find the mean by deviation method/ assumed mean method., , , , , , , , , , 2. Ican find the mean by step deviation method.