Question

The following table gives the life time in days of 100 electricity tubes of a
certain make:
Lifetime in
days No. of
tubes
Less than 50 8
Less than 100 23
Less than 150 55
Less than 200 81
Less than 250 93
Less than 300 100
Find the mean lifetime of electricity tubes using step deviation
method.

Answer 1

Step-by-step explanation:

Hope this attachment will help u.........

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Answer 2

Answer:

step deviation method is, X=A+∑f∑fd′×i