How many times oxyhaemoglobin is less stable than carboxyhaemoglobin?
The following table gives the life-time (in days) of 100 electric bulbs of a certain brand.
Life−time(in days)Less than 50Less than 100Less than 150Less than 200Less than 250Less than 300Number of bulbs721527991100
From this table,construct the frequency distribution table.
The following table gives the lifetime in days of 100 electricity tubes of a certain make:
Find the mean lifetime of electricity tubes by the step deviation method.