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killed by one bullet

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by sanju09 » Sat Apr 04, 2009 2:30 am
A gangster fires 4 bullets at the police inspector. The probability that the police inspector will be killed by one bullet is 0.4. What is the probability that the police inspector survives?
A. (0.6) ^ 4
B. (0.4) ^ 4
C. 1 - (0.6) ^ 4
D. 1 - (0.4) ^ 4
E. none of these
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Source: — Problem Solving |

by scoobydooby » Sat Apr 04, 2009 5:46 am
probability that the inspector survives in one bullet; 1-0.4=0.6
probability that he survives after the shootout (4 bullets): (0.6)^4

hence A
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