two mechanics worked on a car. the first mechanic work for 5 hours and the second mechanic worked for 15 hours. Together they charged a total of $1800. What was the rate charge per hour by each mechanic if the Some of the two rates was $190

A. the following events are mutually exclusive: living in california and watching american idol. true or false b. the number of patients seen by an outpatient practice is an example of a discrete random variable. true or false c. the law of large numbers states that as the number of times an event experiment is conducted increases, the likelihood of the actual probability of an event approaching the theoretical probability decreases. true or false d. measuring the time it takes for patients to enter the operating room is an example of a continuous random variable. true or false