Find the quartiles for the distribution of examination marks given below: Marks 30 39 40 49 50 59 60 69 70 79 80 89 90 99 – – – – – – – Number of 8 87 190 304 211 85 20 Students We need the class boundaries and cumulative frequencies to meet the requirement of the formula. Class Limits Frequency Class Boundaries Cumulative Frequency 30 39 8 29.5 39.5 8 – – 40 49 87 39.5 49.5 95 – – 50 59 190 49.5 59.5 285 – – 60 69 304 59.5 69.5 589 – – 70 79 211 69.5 79.5 800 – – 80 89 85 79.5 89.5 885 – – 90 99 20 89.5 99.5 905 – – 905 l = 49.5, h = 10, f = 190 and C = 95 l = 59.5, h = 10, f = 304 and C = 285 l = 69.5, h = 10, f = 211 and C = 589
Find the quartiles for the distribution of examination marks given below: Marks 30 – 39 40 – 49 50 – 59 60 – 69 70 – 79 80 – 89 90 – 99 Number of Students 8 87 190 304 211 85 20 We need the class boundaries and cumulative frequencies to meet the requirement of the formula. Class Limits Frequency Class Boundaries Cumulative Frequency 30 – 39 8 29.5 – 39.5 8 40 – 49 87 39.5 – 49.5 95 50 – 59 190 49.5 – 59.5 285 60 – 69 304 59.5 – 69.5 589 70 – 79 211 69.5 – 79.5 800 80 – 89 85 79.5 – 89.5 885 90 – 99 20 89.5 – 99.5 905 905 l = 49.5, h = 10, f = 190 and C = 95 l = 59.5, h = 10, f = 304 and C = 285 l = 69.5, h = 10, f = 211 and C = 589