During a severe storm, electrical transformers that function independently are expected to operate 85 percent of the time. suppose 20 electrical transformers are randomly selected from the population. let the random variable
t represent the number of electrical transformers operating during a severe storm. which of the following is the best interpretation of the random variable t ?

a. it is a binomial variable with mean 17 transformers and standard deviation \sqrt{2.55}2.55 transformers.
b. it is a binomial variable with mean 17 severe storms and standard deviation \sqrt{2.55}2.55 severe storms.
c. it is a binomial variable with mean 0.85 transformer and standard deviation 20 transformers.
d. it is a variable that is not binomial with mean 17 transformers and standard deviation \sqrt{2.55}2.55transformers.
e. it is a variable that is not binomial with mean 0.85 severe storm and standard deviation 20 severe storms.