Statistical Investigation | Athletics Day Scoresheet

This week, we were using statistical investigation to find out the averages for each teams score.

First, we added up the data on a Google Sheet. To add a data set, we can use repeated addition or a multiplication strategy. I can speed up the process by getting all of the data and using multiplication. If the data set was: 2, 3, 3, 2, 1, 3, 4 and 2. Instead of adding this, we can do this: (2 x 3) + (3 x 3) + (1 x 1) + (4 x 1) = ???. By doing this it makes things easier and faster. 2 x 3 = 6, 3 x 3 = 9, 1 x 1 = 1, 4 x 1 = 4, then add all of these numbers. 6 + 9 + 1 + 4 = 20. 20 is the score that the team got. 

To find the average group score, we need to add all of the classes points up then divide that by the number of classes there are (9). If all of the scores added up, 19 + 17 + 19 + 26 + 17 + 24 + 18 + 18 + 24 = 182. 182 ÷ 9 = 20.2. This is because if we know 18 ÷ 2 = 9, we should know how to do 180 ÷ 20 because of place values. 2 ÷ 9 = 0.222222222 but to get a less complicated answer, we round. The rule with rounding is that if the number is four and under, we need to round down. This is called 4 Floor. However, if the decimal is higher than 5, it rounds up. 5 High. 

Understanding how to use statistical investigation is important because it can help to find out the scores of different things.

LI: To use statistical investigation.