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Mathematics

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

1.1-2.0, 2.1-3.0 and 3.1-4.0.

Statistics

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Answer

Class limitExclusive class limit
1.1 - 2.01.05 - 2.05
2.1 - 3.02.05 - 3.05
3.1 - 4.03.05 - 4.05

In case of frequency 1.1-2.0 the lower class limit is 1.05, the upper class limit is 2.05 and the class mark is

=1.05+2.052=3.12=1.55= \dfrac{1.05 + 2.05}{2} \\[1em] = \dfrac{3.1}{2} \\[1em] = 1.55

In case of frequency 2.1-3.0 the lower class limit is 2.05, the upper class limit is 3.05 and the class mark is

=2.05+3.052=5.12=2.55= \dfrac{2.05 + 3.05}{2} \\[1em] = \dfrac{5.1}{2} \\[1em] = 2.55

In case of frequency 3.1-4.0 the lower class limit is 3.05, the upper class limit is 4.05 and the class mark is

=3.05+4.052=7.12=3.55= \dfrac{3.05 + 4.05}{2} \\[1em] = \dfrac{7.1}{2} \\[1em] = 3.55

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