in a school district 85% of children are covered by some type of health insurance. If 4 children are selected at random, what is the probability that none are covered?

And using the probability mass function we got:

Step-by-step explanation:

Let X the random variable of interest "number of children covered by some type of health insurance", on this case we now that:

The probability mass function for the Binomial distribution is given as:

Where (nCx) means combinatory and it's given by this formula:

And we want to find this probability:

And using the probability mass function we got:

a

step-by-step explanation:

the answer is a