Interpreting pie and bar charts

[BlueKaiza]

Homework Statement

I do not have the actual answer, looking for feedback.

Relevant Equations

Formula for converting values into percentages(value/n×100)

Formula for converting a pie char value to a percentage(n/360×100)

Working
1.

a (i) 1/4=×5%

(ii)120/360×100=33.3%

(b)

newspaper=£9000

Leaf=£6500

Transport=£19000

55000-34500=£20500

Tv=16.7%

0.167×55000=£9185 ( answer)

(c)

Tv=16.7%

News=25%

Leaf=15.3%

Other=9.72%

Trans=33.3%(answer)

Note: they were rounded to (3sf)

 

[jedishrfu]

For (1. i) By visual inspection, NEWS is 1/4 of the pie and hence 25% of 100%

(1/4) * 100 = (0.25) * 100 = 25 --> 25%

For (1. ii) I don't see any amounts for the slices in the problem.

By visual inspection, TRANSPORT + TV = 50% and TRANSPORT = TV + OTHER + LEAF and TRANSPORT + TV + OTHER + LEAF = 75% since NEWS = 25%

Does that help you solve it now? Basically you can't say TRANSPORT is 1/3 of the pie.

Truthfully, I don't like these kinds of problems where you must infer things by visual inspection and sometimes you might get it wrong. You saw 1/3 for TRANSPORT and I saw the TRANSPORT slice is the same size as TV+OTHER+LEAF slices.

However, working with PIE charts alone sometimes needs that visual inspection skill.