Question

31% of US adults say they are more likely to make purchases during a sales tax holiday. You randomly select 10 adults. Find the probability that the number of adults who say they are more likely to make purchases during a sales tax holiday is exactly 2 more than two between two and five inclusive

Answer 1

#The R-code is
round(dbinom(2,10,0.31),5)
[1] 0.22219
1-sum(round(dbinom(0:2,10,0.31),5))
[1] 0.64345
sum(round(dbinom(3:5,10,0.31),5))
[1] 0.58834