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

Answer:

Less than 50 8

Less than 100 23

Less than 150 55

Less than 200 81

Less than 250 93

Less than 300 100