You measured the height to 23.6 m whereas the original height is 25 m. So what’s your percent error?
Formula for percent error = (measured value – real value)/real value * 100
So let’s calculate your percent error:
(23.6 – 25)/25 * 100 = - 5.6%
A ‘-‘ sign means that your measured value is lower than the true value.
If you would have measured the height to 26.7 m whereas the real value stands the same to 25 m, then your percent error is
(26.7 – 25)/25 * 100 = 6.8%
A positive value means that your measurement is higher than the true value.
You did a lot of calculation. Now relax
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