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the following tables gives the life time of 500 CFL lamps
Life time : 9,10,11,12,,13,14,more than 14
No of lamp: 26, 71,82,102,89,77,53
total : 500
a bulb is selected at random . the probabilty that the life time fo the selected bulb is atmost 11 months is given by

Read Solution (Total 2)

Total No. of bulbs (possibility for selecting one bulb randomly) = 500C1 = 500
Total No. of favorable event of getting life time at most 11 months are 26,71,82 sum up as 179.
So Probability = Favorable event / total events
= 179/500
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