expected value investment problem; you have $100 and can invest into a stock. the returns are volatile and you may get either $120 with a probability of 0.4, or $90 with probability 0.6

Little’s law firm has just one lawyer. customers arrive randomly at an average rate of 6 per 8 hour workday. service times have a mean of 50 minutes and a standard deviation of 20 minutes. how long does a customer spend at little’s law firm on average?

Express the following as a function of a single angle. cos(60) cos(-20) - sin(60) sin(-20)

The table shows the results of three plays in a football game. what is the net result of the three plays? football game 1st play 5 yards 2nd play -9 yards 3rd play 12 yards