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Question

Find mean by step – deviation method:
1834237_ed5de892c1e844f28f8221c65248f9b0.PNG


Solution

Here, $$A = 87.50$$ and $$h = 7$$
$$\bar{x}=A+ h \times \dfrac{\sum f_iu_i}{\sum f_i}=87.5 + 7 \times \dfrac{29}{150}=87.5 + 1.35 = 88.85$$
1799823_1834237_ans_74411115ebcc45e99b9e7a8bdc8340bd.PNG

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