probability that a trap will catch a rodent

the probability that a trap will catch a rodent is 0.4 a) what is the probability that out of 5 traps set within a certain forest at least 1 will catch a rodent b) all will catch a rodent

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1 Answer

prob av 1 trap=0.4

b...chans all 5 werk=0.4^5...=0.01024000000...bout 1%

a...best tu du this bakward...chans it WONT werk=0.6

so chans nun av em katch a rat=0.6^5=0.0777599999999...

or bout 7.776%

thus, chans 1 av em katch sumthun=100-7.776%=92.2%
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