SOLUTION: Ninety percent of the trees planted by a landscaping firm survive. What is the
probability that of the next 13 trees planted,
a. at most ten will survive?
b. at least ten will s
Algebra.Com
Question 1158395: Ninety percent of the trees planted by a landscaping firm survive. What is the
probability that of the next 13 trees planted,
a. at most ten will survive?
b. at least ten will survive?
c. exactly ten will survive?
Answer by solver91311(24713) (Show Source): You can put this solution on YOUR website!
The probability of exactly 
successes in 
trials where the probability of success on any given trial is 
is given by:
\ =\ {{n}\choose{k}}\,(p)^k\,(1-p)^{n-k})
The probability of at least successes in trials where the probability of success on any given trial is is given by:
\ =\ \sum_{r=k}^n{{n}\choose{r}}\,(p)^r\,(1-p)^{n-r})
The probability of at most successes in trials where the probability of success on any given trial is is given by:
\ =\ \sum_{r=0}^k{{n}\choose{r}}\,(p)^r\,(1-p)^{n-r})
For your problem, 
, 
, and 
You can do your own arithmetic.
John
My calculator said it, I believe it, that settles it
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