The average of five numbers is 130. If four of the numbers are 117, 134, 135, and 108, what is the fifth number?

The average of four rates is 8.50%. If three of the rates are 6.50%, 5.00%, and 13.50%, what is the fourth rate?

The average of five numbers is 75 and the average of three other numbers is 40. Find the average of all eight of the numbers.

A footwear retailer sold 10 pairs of sneakers for $40 each, 11 pairs of leather shoes for $160 each, 6 pairs of boots for $215 each, and 8 pairs of sandals for $15 each.

1. What is the weighted average price of the footwear sold?
2. What is the simple arithmetic average?
3. Which method is the most suitable for determining the average price of the footwear sold by the retailer?

Weighted average

Simple arithmetic average

A call center has four categories of employees, each paid a particular wage. Managers are paid $30 an hour, clerks are paid $15 an hour, technicians are paid $20 an hour, and administrative assistants are paid $15 an hour. The call center has 3 managers, 18 clerks, 4 technicians, and 8 administrative assistants.

. What is the simple arithmetic average of the hourly rates?

What is the weighted average of the hourly rates?

Olivia invested 45% of his money in mutual funds, 35% in real estate, and 20% in stocks. If the value of the money that he invested in mutual funds, real estate, and stocks grew by 3%, 8%, and 10% respectively, what was the average growth on his total investment?

What was the average growth on his total investment?

A business math course is marked on four different components. The table lists the weights of the different components and Timothy's marks on each of the component.

Component	Weight	Timothy's Mark
Online	20	78
Test 1	20	85
Test 2	20	86
Final	40	65

What is his overall course grade based on these weights and marks obtained?