The number of plastic straws produced by a machine varies directly as the amount of time the machine is operating. If the machine produces 20,000 straws in 8 hours, how many straws can it produce in 50 hours? The time required to empty a tank varies inversely as the rate of pumping. If a pump can empty a tank in 45 minutes at the rate of 600 gallons per minute, how long will it take the pump to empty the same tank at the rate of 1000 gallons per minute?

The mean rounded to the nearest tenth of the following data set is:
15, 16, 17, 23, 11, 19, 20, 15, 18, 22, 15, 19

The mode of the following data set is:
15, 16, 17, 23, 11, 19, 20, 15, 18, 22, 15, 19

The median (rounded to the nearest tenth if needed) of the following data set is:
15, 16, 17, 23, 11, 19, 20, 15, 18, 22, 15

The first quartile (rounded to the nearest tenth if needed) of the following data set is:
15, 16, 17, 23, 11, 19, 20, 15, 18, 22, 15

If the local lunch shop offers chicken, tuna, and vegetable sandwiches on plain, onion, or garlic bagels, how many possible sandwiches can be served?

How many committees of 3 people are possible from a group of 12?

How many different seating arrangements are possible for 6 people in 4 chairs?

What is the probability of rolling a 4 on a die?