NumericalModerate3 marks
Find the mean of the following frequency distribution using step-deviation method. Take assumed mean = 28
Topic: Mean / median / mode / quartiles
Previous-year question practice database
Answer
Exam answer
Mean: use step-deviation with assumed mean A=28 and the supplied frequency table.
Explanation
Create columns class mark x, u=(x−28)/h, fu. Then x̄=28+h(Σfu/Σf).
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