A geneticist is conducting research on pest-resistant walnut trees. He has developed a set of trees, when crossed, to produce offspring as follows: 50% of all trees are very resistant, 20% of trees...

Extracted text: A geneticist is conducting research on pest-resistant walnut trees. He has developed a set of trees, when crossed, to produce offspring as follows: 50% of all trees are very resistant, 20% of trees are somewhat resistant, and 20% are susceptible to invasion by pest. The probability that a tree will be at least somewhat resistant is: Please enter your answer as a DECIMAL