Aplumber charges $55 for a service call plus $35 per hour. if the plumber’s bill was $160, how many hours was he there?

As voters exit the polls, you ask a representative random sample of voters if they voted for a proposition. if the true percentage of voters who vote for the proposition is 63%, what is the probability that, in your sample, exactly 5 do not voted for the proposition before 2 voted for the proposition? the probability is