bus-stat-book1

3rd quartile and percentile are the same iii answer

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Unformatted text preview: B C D E F G Income(in 30 70 60 100 200 150 300 rupees) Calculate the arithmetic average by (a)Direct method and (b)Short-cut method 27. Calculate the mean for the data X: 5 8 12 15 20 24 f: 3 4 6 5 3 2 136 28. The following table gives the distribution of the number of workers according to the weekly wage in a company. Weekly wage (in Rs.100’ s) Numbers of workers 40-50 0-10 10-20 20-30 30-40 5 10 15 18 50-60 60-70 70-80 7 8 5 3 Obtain the mean weekly wage. 29. Mean of 20 values is 45. If one of these values is to be taken 64 instead of 46, find the corrected mean (ans:44.1) 30. From the following data, find the missing frequency when mean is 15.38 Size : 10 12 14 16 18 20 Frequency: 3 7 __ 20 8 5 31. The following table gives the weekly wages in rupees of workers in a certain commercial organization. The frequency of the class-interval 49-52 is missing. 40-43 43-46 46-49 49-52 52-55 Weekly wages (in rs) : 31 58 60 __ 27 Number of workers It is known that the mean of the above frequency distribution is Rs .47.2. Find the missing frequency. 32. Find combined mean from the following data X1 = 210 n1=50 X2 = 150 n2 =100 33. Find combined mean from the following data Group 1 2 3 Number 200 250 300 Mean 25 10 15 137 34. 35. 36. Average monthly production of a certain factory for the first 9 months is 2584, and for remaining three months it is 2416 units. Calculate average monthly production for the year. The marks of a student in written and oral tests in subjects A, B and C are as follows. The written test marks are out of 75 and the oral test marks are out of 25. Find the weighted mean of the marks in written test taking the marks in oral test as weight. The marks of written test and oral test respectively as follows: 27, 24, 43 and 5, 10, 15. The monthly income of 8 families is given below. Find GM. Family : Income(Rs) 37. A 70 B 10 C 500 D 75 E 8 F 250 G 8 H 42 The following table gives the diameters of screws obtained in a sample inquiry. Calculate the mean diameter using geometric average. Diameter(m.m) No. of. Screws 130 3 13...
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