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The probability that certain electrinic component fails when first use

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The probability that certain electrinic component fails when first use  [#permalink]

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New post 30 Jan 2019, 22:43
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A
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C
D
E

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  15% (low)

Question Stats:

77% (01:13) correct 23% (01:12) wrong based on 48 sessions

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The probability that certain electronic component fails when first used is 0.10. If it does not fail immediately, the probability that it lasts for one year is 0.99. What is the probability that a new component will last for one year?
A) 0.935
B) 0.862
C) 0.91
D) 0.891
E) 0.9
Spoiler: OA

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Re: The probability that certain electrinic component fails when first use  [#permalink]

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New post 30 Jan 2019, 23:41
4d
0.9 x 0.99 = 0.891

Is option D the correct answer?
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Re: The probability that certain electrinic component fails when first use  [#permalink]

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New post 31 Jan 2019, 21:33
OE :

probability that a new component will last for one year = probability the component wont fail immediately * probability that it lasts for one year
= 0.9 * 0.99
= 0.891

OA = D
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Re: The probability that certain electrinic component fails when first use  [#permalink]

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New post 01 Mar 2019, 05:12
Prob not fail = 1-0.1= 0.9
prob that last for 1 year= .9*.99=.891
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Re: The probability that certain electrinic component fails when first use   [#permalink] 01 Mar 2019, 05:12
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