# Percentage uncertainty

#### gii

Hello

I was given following homework question.

gradient1 of the line is 0.503
gradient2 of the line intersecting the line above is 0.167.
Find out the percentage uncertainty in the gradient.

i thought you have to do (0.503-0.167)/0.503
is that right?

Last edited:
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#### gii

any ideas if i'm right?

#### Redbelly98

Staff Emeritus
Homework Helper
Welcome to Physics Forums.

Hello

I was given following homework question.

gradient1 of the line is 0.503
gradient2 of the line intersecting the line above is 0.167.
Find out the percentage uncertainty in the gradient.

i thought you have to do (0.503-0.167)/0.503
is that right?

I don't understand what the problem is asking from your description. Are there two intersecting lines, with gradients 0.503 and 0.167? Are these gradients given, or are you calculating them somehow?

#### gii

Welcome to Physics Forums.

I don't understand what the problem is asking from your description. Are there two intersecting lines, with gradients 0.503 and 0.167? Are these gradients given, or are you calculating them somehow?
yes there are 2 intersecting lines with one line of best fit having the gradient 0.503 and the other line is the worst straight line having the gradient 0.167

#### Redbelly98

Staff Emeritus
Homework Helper
Okay, thanks for clarifying.

i thought you have to do (0.503-0.167)/0.503
is that right?
Multiply that calculation by 100% (to get a percentage), and then it looks right.

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