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The snipers shoot a certain target. Their probabilities of

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The snipers shoot a certain target. Their probabilities of [#permalink] New post 15 Jul 2003, 10:09
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The snipers shoot a certain target. Their probabilities of hitting the target are 0.9, 0.7, and 0.5 respectively. The snipers make one salvo. What is the probability:

1. of having the target killed?
2. of having the target NOT killed?
3. that exactly one sniper missed?
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 [#permalink] New post 15 Jul 2003, 10:24
Ok lovely question,

(1) 1 - (0.1)(0.3)(0.5).

(2) All three miss so, (0.1)(0.3)(0.5).

(3) (0.9)(0.7)(0.5) + (0.1)(0.7)(0.5) + (0.9)(0.3)(0.5)
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 [#permalink] New post 15 Jul 2003, 10:45
1.0.985

2.0.015

cud u explain how u solved the third one.
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 [#permalink] New post 15 Jul 2003, 12:02
evensflow wrote:
Ok lovely question,

(1) 1 - (0.1)(0.3)(0.5).

(2) All three miss so, (0.1)(0.3)(0.5).

(3) (0.9)(0.7)(0.5) + (0.1)(0.7)(0.5) + (0.9)(0.3)(0.5)



99% perfect.
on a real test you have to perform these not so messy calculations to shine like a star.
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 [#permalink] New post 15 Jul 2003, 13:49
If You really insist on the final answers then here they are

1. 0.985

2. 0.015

3. 0.485

:)
  [#permalink] 15 Jul 2003, 13:49
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