At an electronics store, 19% of the customers who purchase a home theater system also pay for the professional installation that the store offers. What is the probability that the eighth customer to buy a home theater system today will also be the first to pay for
the professional installation?

Explanation:

Given

-- probability that a customer pays for professional installation

Required

Determine the probability that the 8th customer is the first to pay

First, we calculate the probability that a customer do not pay for installation.

Represent this with q.

The question implies that the first 7 customers chose not to pay.

So, the event is represented as:

Event: q q q q q q q q p

And the probability is:

Approximate

i do not get the question.