Class interval (minutes)# dryer failed (frequency) 1000-1100 29 1100-1200 63 1200 - 1300 55 1300-1400 90 1400-1500 130 1500 - 1600 27 1600-1700 46 1700 - 1800 42 1800- 1900 Randomly selected hair dryers of a particular brand have been used continuously and their life-times noted in above given schedule. 4 Find the survival probability or reliability at time = 1200 Hrs Round answer to TWO decimal places.

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