Question

The probability that a randomly selected 2-year-old male chipmunk will live to be 3 years old is 0.99085.(b) What is the probability that nine randomly selected 2-year-old male chipmunks will live to be 3 years old?(c) What is the probability that at least one of nine randomly selected 2-year-old male chipmunks will not live to be 3 years old?

Answer 1

b) 9 randomly selected 2-year-old male chipmunks will live to be 3 years old.

`(0.99085)^9\approx0.92060`

Answer b: 0.92060

c) probability that at least one of nine randomly selected 2-year-old male chipmunks will not live to be 3 years old

Probability that one randomly selected 2-year-old male chipmunk will NOT live to be 3 years old:

`1-0.99085=0.00915`

Probability that none of the nine will live to be 3 years old is:

`(0.00915)^9=4.4956*10^(-19)`

Probability that at least one of nine randomly selected 2-year-old male chipmunks will not live to be 3 years old:

`1-4.4956*10^(-19)\approx1`

Answer c: it approximates to 1