Question

Calculate the Arithmetic mean by step deviation method.
Marks 10-20 20-30 30-40
40-50 50-60 60-70 70-80 80-90
No of student 7 13 20 25 10 8 6 1​

Answer 1

Answer:

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Answer 2

Answer:

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$Mean \: = \frac{Sum \: of \: Observation}{No. \: of \: Observation}$

$Mean \: = \frac{10 + 20 + 20 + 30 + 30 + 40 + 40 + 50 + 50 + 60 + 60 + 70 + 70 + 80 + 80 + 90}{8}$

$Mean \: = \frac{800}{8}$

$=100$

$Mean \: = 100$