Question 1194231
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It is a binomial distribution probability problem with the number of trials 
n=20  and individual success probability p=0.75.



Without writing long formulas, I refer to this source

https://www.sjsu.edu/people/saul.cohn/courses/stats/s0/BinomialProbabTable.pdf

which gives the tables of calculated probabilities for different values of n and p.



Find there the table for n=20  and  p=0.75.



It is what you ask for, in the form ready for consumption.
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Solved.