1.

Find the mean of the following continuous distribution. `{:("Class Interval",f),(" "0-10,8),(" "10-20,4),(" "20-30,6),(" "30-40,3),(" "40-50,4):}`A. 20.8B. 21.4C. 21.8D. 22.2

Answer» Correct Answer - B
`{:("Class Interval",D,x,fx),(" "0-10,8,5,40),(" "10-20,4,15,60),(" "20-30,6,25,150),(" "30-40,3,35,105),(" "40-50,4,45,180):}`
Here `sum fx = 535`
`sum f = 25`
`"Mean" = (sum fx)/(sum f) = (535)/(25) = 21.4`.


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