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24 Apr 2020, 02:11
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A
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Difficulty:
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Question Stats:
81% (00:39) correct
19%
(00:49)
wrong
based on 154
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If a light bulb is selected at random from a shipment, what is the probability that the light bulb is defective?
(1) The ratio of the number of defective light bulbs to the number of nondefective light bulbs is 1 to 60.
(2) The shipment contains 720 light bulbs.
24 Apr 2020, 03:48
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Q. the probability that the light bulb is defective?
(1) no of defective/ no of good = 1/ 60.
--> the probability that the light bulb is defective = 1/(1+60) = 1/61
SUFFICIENT
(2) The shipment contains 720 light bulbs.
--> Since we have no information about no of defective/non-defective bulbs in a shipment, we cannot deduce the probability that the light bulb is defective if a bulb is selected from 720 bulbs at random
NOT SUFFICIENT
FINAL ANSWER IS (A)
Posted from my mobile device
(1) no of defective/ no of good = 1/ 60.
--> the probability that the light bulb is defective = 1/(1+60) = 1/61
SUFFICIENT
(2) The shipment contains 720 light bulbs.
--> Since we have no information about no of defective/non-defective bulbs in a shipment, we cannot deduce the probability that the light bulb is defective if a bulb is selected from 720 bulbs at random
NOT SUFFICIENT
FINAL ANSWER IS (A)
Posted from my mobile device
ArunSharma12
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24 Apr 2020, 07:13
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If a light bulb is selected at random from a shipment, what is the probability that the light bulb is defective?
(1) The ratio of the number of defective light bulbs to the number of nondefective light bulbs is 1 to 60.
(2) The shipment contains 720 light bulbs.
probability that the light bulb is defective = number of defective light bulbs/ total number of light bulbs
statement 1:
defective bulbs/ non-defective bulbs = 1/60
defective bulbs = x, total bulbs = x + 60x = 61x
Probability = 1/61
statement 2:
total bulbs = 720
number of defective bulbs not known
not sufficient
Ans: A
(1) The ratio of the number of defective light bulbs to the number of nondefective light bulbs is 1 to 60.
(2) The shipment contains 720 light bulbs.
probability that the light bulb is defective = number of defective light bulbs/ total number of light bulbs
statement 1:
defective bulbs/ non-defective bulbs = 1/60
defective bulbs = x, total bulbs = x + 60x = 61x
Probability = 1/61
statement 2:
total bulbs = 720
number of defective bulbs not known
not sufficient
Ans: A
