A geneticist is conducting research on pest-resistant walnut trees. He has developed a set of trees, when crossed, to produce offspring as follows: 40% of all trees are very resistant, 30% of trees are somewhat resistant, and 20% are susceptible to invasion by pest, for the rest, susceptibility status is undetermined. The probability of knowing that a tree from a crossing is at least somewhat resistant is:
A)P = 0.7.
B)P = 0.4.
C)P = 0.3.
D)P = 0.1.

Question

Quizplus · Accepted Answer

The probability of a tree being at least somewhat resistant is the sum of the probabilities of a tree being very resistant or somewhat resistant, which is 40% + 30% = 70% or 0.7.

A Geneticist Is Conducting Research on Pest-Resistant Walnut Trees