For 4 weeks, William volunteered as a helper for swimming classes. The first week, he volunteered for 8 hours. He volunteered for 12 hours in the second week, and another 12 hours in the third week. The fourth week, he volunteered for 9 hours. For how many hours did he volunteer per week, on average?

(1/4)( 8 + 12 +12 + 9) = 41/4 = 10 1/4 hours average

Well, it sounds like William really made a splash with his volunteering! Let's do some calculations to find out his average hours per week.

In total, William volunteered for 8 + 12 + 12 + 9 = 41 hours over the 4 weeks.

To find the average, we divide the total hours by the number of weeks: 41 hours / 4 weeks = 10.25 hours.

So, on average, William spent about 10.25 hours per week helping out with the swimming classes. That's a lot of time in the water!

To find the average number of hours William volunteered per week, we need to add up the total number of hours volunteered and divide by the number of weeks.

First, let's calculate the total number of hours volunteered: 8 + 12 + 12 + 9 = 41 hours

Next, let's find the average by dividing the total number of hours by the number of weeks: 41 hours / 4 weeks = 10.25 hours

Therefore, William volunteered an average of 10.25 hours per week.

To find the average number of hours William volunteered per week, we need to add up the total number of hours he volunteered and then divide it by the number of weeks.

First, let's calculate the total number of hours volunteered:
8 hours + 12 hours + 12 hours + 9 hours = 41 hours

Since William volunteered for 4 weeks, we divide the total number of hours (41 hours) by the number of weeks (4 weeks) to find the average number of hours volunteered per week.

41 hours / 4 weeks = 10.25 hours

Therefore, William volunteered an average of 10.25 hours per week.