Question 914965: Eighty percent of trees planted by a woodlands conservation group survive. What is the probability that:
a. 10 of the 12 trees just planted will survive?
b. at least 10 of the trees just planted will survive?
Answer by ewatrrr(24785)   (Show Source):
You can put this solution on YOUR website! p(survive) = .80, n = 12
a) P(x=10) = binompdf(12, .80, 10) = .2835
b) P(x ≤ 10) = binomcdf(12, .80, 10) = .7251
Re: TY
Awesome! to hear You are able to check Your work using
Your calculator functions: binompdf(), binomcdf() and normalcdf()
....
normalcdf with a number of applications:
P( to left of z-score) = normalcdf(-100,z)
P( to right of z-score) = normalcdf(z,100)
P(between to z-scores) = normalcdf(smaller z, larger z)
....
invNorm(.95) for finding z-score knowing the % is also another useful tool.
Wish You the Best in your Studies.
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