Find the actual lower and upper class limits and also the class marks of the classes:

1.1-2.0 ,2.1-3.0 , 3.1-4.0

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Solution

Actual lower limit= 1.95,2.95,3.95.
Actual upper limit= 2.05, 3.05, 4.05.
We add0.05 in upper where 0.05 subtracted from lower limit.

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Class marks of a distribution are 26, 31, 36, 41, 46, 51, 61, 66, 71. The lower and upper class limits of the first class interval are

The class midpoint is equal to:

(a) The average of the upper class limit and the lower class limit.

(b) The product of upper class limit and the lower class limit.

(d) None of the above.

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