Using graph to estimate a value?

I’m confused a little with this question. Estimating values have to much ambiguity.

I’ve added the values suggested, for me if I was to estimate the value it would be between 40-45, so 43 but I don’t know if there’s a specific approach to how I am meant to answer such questions.

See below:

(edited 2 weeks ago)

Reply 1

DerDracologe

Draw a line of best fit from your data points and then use that to find the estimated v value when i is 3

Reply 2

KingRich

Original post by DerDracologe

Draw a line of best fit from your data points and then use that to find the estimated v value when i is 3

When drawing this line of best fit, do I draw the line from the first point and land on the last point, or the line where the majority of the points are equal distance apart from the line?

(edited 2 weeks ago)

Reply 3

DerDracologe

Original post by KingRich

When drawing this line of best fit, do I draw the line from the first point and land on the last point, or the line where the majority of the points are equal distance apart from the line?

When drawing a line of best fit you want it to have roughly the same number of points on each side. It doesn’t need to go through 0 or the first or last point 🙂

Reply 4

mqb2766

Original post by KingRich

When drawing this line of best fit, do I draw the line from the first point and land on the last point, or the line where the majority of the points are equal distance apart from the line?

Not that important, but Id have doubled the width of the x-axis, so 2 boxes for every 1 amp. Its easier to do a best fit line and read off values.

Reply 5

KingRich

Original post by mqb2766

Not that important, but Id have doubled the width of the x-axis, so 2 boxes for every 1 amp. Its easier to do a best fit line and read off values.

Other than the drawing the line, would my answer be appropriate?

Reply 6

mqb2766

Original post by KingRich

Other than the drawing the line, would my answer be appropriate?

If you think its a line, thought it could be a slowly varying curve. v is only measured to the nearest 5 and i is only measured to the nearest 0.1 so thats about the only thing you can use to determine whether its a straight line or it has a slight curve. Personally, I think youre/the other poster is about right, but its worth thinking about as the question doesnt specify it.