Originally Posted by

**akosuaaddei** Many utilities companies have begun to promote energy conservation

by offering discount rates to customers who keep their energy usage below

certain established subsidy standards.A recent EPA report notes that

70% of residents in a community have reduced their electricity consumption

sufficiently to gualify for discount rates. Suppose 20 residential subscribers

are known to have randomly been selected from the community

a,Explain how the situation can be modeled by the Binomial distribution

b,Find the expected number of the residence who qualifies for the subsidy