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(1) The mean the mars. Secured by 25 students Sectori Ain 41that of 95 Studer Section 51 and ThatStudeman 6 Secrom c L 53. Find the combined means4 Students of three section of cb ..class30the |
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Answer» ection A: Number of students = 25 Mean marks = 47 We know that,Sum of observations = Mean × Number of observations ∴ Sum of marks obtained by students of section A = 47 ×25= 1175 Section B: Number of students = 35 Mean marks = 51 ∴ Sum of marks obtained by students of section B = 51 ×35 = 1785 Section C: Number of students = 30 Mean marks = 53 ∴ Sum of marks obtained by students of section C = 53 ×30 = 1590 Now, sum of marks obtained by all students of three sections = Sum of marks obtained by students of section A + Sum of marks obtained by studes of section B + Sum of marks obtained by students of section C = 1175 + 1785 + 1590 = 4550 Total number of students = 25 + 35 + 30 = 90 Mean marks scored by 90 students =sum of marks scored by 90students ÷90 =4550/90 =50.6(approx) |
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