probability

[majan12]

p = 1/60000
calculate the probability of no failures in 25 attempts

then calculate the probability of at least one failure in 25 attempts

i need help please.... :?:

 

[arthur ohlsten]

probability of sucess=p
probability of failure,q=[1-p]

probability of 25 failures, p^0 q^25

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probability of 1 sucess,and 24 failures q^24 p but the sucess could occur in any of 25 trials
probability = 25 p q^24

Arthur

 

[majan12]

arthur can't i use poisson distribution or is this more binomial distribution. i can run megastat on excel to obtain the value
please help me....