what proportion of offspring will be of use to him? What is the probability that, in 100 such offspring, none will be worthy of further study?  And what is the mean value of the number of useful offspring in 100?

A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
Section: Chapter Questions
Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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A plant breeder knows by experience that when he crosses 2 varieties of currant, 10% of the offspring will be disease-resistance, and that only 20% of the offspring will be sufficiently vigorous growers to warrant further trial. if he wishes to breed plants which are both vigorous and disease-resistant, and these two characteristics are independent of one another.

what proportion of offspring will be of use to him?

What is the probability that, in 100 such offspring, none will be worthy of further study? 

And what is the mean value of the number of useful offspring in 100?

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