Mustafa and Diego both work as plumbers. Mustafa charges $150 to mak a service call plus $50 per hour. Diego charges $50 to make a service call plus $75 per hour. a) Write an equation to represent the cost (C) of hiring Mustafa for n hours.
b) Write an equation to represent the cost (C) of hiring Diego for n hours.
c) Today, they both worked the same number of hours and earned the same amount of money. How many hours did they work?

People end up tossing 12% of what they buy at the grocery store. assume this is the true population proportion and that you plan to take a sample survey of 540 grocery shoppers to further investigate their behavior. a. calculate the mean and the standard error for the sample proportion p. b. describe the sampling distribution of p in part a. draw a graph of this probability distribution with its mean and standard deviation. what is the probability that your survey will provide a sample proportion more than 15%? c. d. population proportion? what is the probability that your survey will provide a sample proportion within + 0.03 of the