Q28 of 69 Page 6

The following table gives the marks scored by 80 students in a class-test:


Find the mean marks scored by a student in the class-test.

Here, the xi’s are large. Now, we apply the step deviation method with a = 175 and h = 50



Now,



⇒x̄ = 175 - 30


⇒x̄ = 145


Hence, the mean marks scored by a student in the class-test is 145


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