The following table gives the life time of 500 CFL lamps:
Life time (months)
|
9
|
10
|
11
|
12
|
13
|
14
|
More than 14
|
Total
|
Number of lamps
|
26
|
71
|
82
|
102
|
89
|
77
|
53
|
500
|
A bulb is selected at random. The probability that the life time of the selected bulbatmost 11 months is given by
A. 82/500
B. 179/500
C. 97/500
D. 268/500
ANS: B
EXPLANATION:
(26+71+82)/500 = 179/500
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