marks number of student

10-19 2

20-29 8

30-39 x

40-49 13

50-59 5

a)given that the first quartile mark is 30.5.Find the value of

b)find the total number of students.

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- Oct 17th 2010, 05:08 AMmastermin346Measures of dispersion problem
marks number of student

10-19 2

20-29 8

30-39 x

40-49 13

50-59 5

a)given that the first quartile mark is 30.5.Find the value of

b)find the total number of students. - Oct 17th 2010, 08:17 AMdexteronlineFirst Quartile
The first quartile is the point below which 25% of the cases fall and above which 75% of the cases fall

10-19 2

20-29 8

30-39 x

40-49 13

50-59 5

x+13+5 = (2+8)3

x+18 = (10)3

x+18 = 30

x = 12