1.

Calculate the median from the following data:Marks:                0-10         10-30                           30-60       60-80                           80-90No. of Students  5              15                           30            8                           2

Answer» Here, total frequency`(N) = 5+15+30+8+2 = 60`
`:.N/2 = 60/2 = 30`
Cumulative frequency equal to or just greater than 30 is 50 that means our Median class is `30-60`.
`:.` Lower boundary class`(l)` = 30
Previous cumulative frequency`(F)` = 20
Median Class Frequency`(f)` = 30
Interval`(i)` = 30
Median = `l+(((N/2) - F)/f)**i`
= `30+((30-20)/30)**30`
= `30+10 = 40`
`Median = 40`


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