It is known that 78% of people inoculated with a certain COVID19 vaccine are protected from the disease. If 120 people were inoculated, find the probability that (a) no one contracts the disease for the first time; (b) fewer than 50 people contracted the disease; (c) more than 70 people contracted the disease.

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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It is known that 78% of people inoculated with a certain COVID19 vaccine are protected from the disease. If 120 people were inoculated, find the probability that (a) no one contracts the disease for the first time; (b) fewer than 50 people contracted the disease; (c) more than 70 people contracted the disease. 

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