The following table give the life time of 400 neon lamps:
Life time
(in hrs)
300-400 400-500 500-600 600-700 700-800 800-900 900-1000
Number
of lamps
14 56 60 86 74 62 48
A bulb is selected at random . Find the probability that the life time of the selected bulb is:
(i) Less than 400
(ii) Between 300 to 800 hours.
(iii) At least 700 hours.
Answers
Answered by
8
Step-by-step explanation:
total no of bulbs = 14+56+60+86+74+62+48=400
(i) probability of bulb life time lesser to 400 = 14/400
=0.035
(ii) probability of bulb life time Between 300 to 800 hours
=(14+56+60+86+74)/400
=0.725
(iii) probability of bulb life time At least 700 hours
=(14+56+60+86)/400
=0.54
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