Frogs A wildlife biologist examines frogs for a genetictrait he suspects may be linked to sensitivity to industrial toxins in the environment. Previous research had estab-lished that this trait is usually found in 1 of every 8 frogs. He collects and examines a dozen frogs. If the frequencyof the trait has not changed, what’s the probability hefinds the trait ina) none of the 12 frogs?b) at least 2 frogs?c) 3 or 4 frogs?d) no more than 4 frogs?

Question
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 estab-
lished 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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