A wildlife biologist examines frogs for a genetic trait he suspects may be linked to sensitivity to industrial toxins in the environment. Previous research had established that this trait is usually found in 1 of every 8 frogs. He collects and examines a dozen frogs.

A wildlife biologist examines frogs for a genetic trait he suspects may be linked to sensitivity to industrial toxins in the environment.
Previous research had established that this trait is usually found in 1 of every 8 frogs. He collects and examines a dozen frogs.
If the frequency of the trait has not changed, what’s the probability he finds the trait in
a) none of the 12 frogs?
b) at least 2 frogs?
c) 3 or 4 frogs?
d) no more than 4 frogs?
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avortarF
1. binompdf(12, .125, 0) = .201
2. binomcdf(12, .875, 10) = .453
3. binompdf(12, .125, 3) + binompdf(12, . 125, 4) = .171
4. binomcdf(12, .125, 4) = .989 Result:A. .201
B. .453
C. .171
D. .989