Thursday, 30 April 2020

The following table gives the life time of 500 CFL lamps:

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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