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 $\displaystyle x$ b)find the total number of students.
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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
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