find the probability

Question

: 70% of residents have reduced their electricity usage sufficiently to qualify for discounted rates. If 5 residential subscribers are randomly selected A. What is the probability that all five qualify for the discounted rates B.find the probability that at least 4 qualify c. Find the probability that most of the residents qualify Show work And please show steps

Answer 1

This is a binomial problem. First is to use the formula to enter the probability of residents that have reduced their electricity usage which is .70. Next use the total number of subjects presented in the scenario which is 5.

If you use Excel, the function is =BINOMDIST(5,5,.7,TRUE) This is for All 5 Qualify

=BINOMDIST(4,5,.7,TRUE) This is for at least 4