Lesson 4
Measurement Error (Part 1)
Let’s check how accurate our measurements are.
4.1: How Long Are These Pencils?
![Two pencils and ruler.](https://cms-im.s3.amazonaws.com/wNzzD3FtEBY2DomVg5GdgLVS?response-content-disposition=inline%3B%20filename%3D%227-7.9.B2.rulerart.png%22%3B%20filename%2A%3DUTF-8%27%277-7.9.B2.rulerart.png&response-content-type=image%2Fpng&X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=AKIAXQCCIHWF3XOEFOW4%2F20240630%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Date=20240630T163232Z&X-Amz-Expires=604800&X-Amz-SignedHeaders=host&X-Amz-Signature=cefd2a1eb00c57ced6d13567377a832c9e9a3dff16f32cb575be9be4c2f00020)
- Estimate the length of each pencil.
- How accurate are your estimates?
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For each estimate, what is the largest possible percent error?
4.2: How Long Are These Floor Boards?
A wood floor is made by laying multiple boards end to end. Each board is measured with a maximum percent error of 5%. What is the maximum percent error for the total length of the floor?