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Answer:
The app's estimate was 38.4 minutes.
Step-by-step explanation:
Suppose, the app's estimated time was [tex]t[/tex] minutes.
Given that, it took 48 minutes to drive downtown. So, the error in estimated time by the app [tex]=(48-t)[/tex] minutes.
It is also given that the error was 20%. So, the amount of error [tex]= (48*0.20)=9.6[/tex] minutes.
Thus, the equation will be......
[tex]48-t= 9.6\\ \\ -t=9.6-48\\ \\ -t=-38.4\\ \\ t= 38.4[/tex]
So, the app's estimate was 38.4 minutes.
Using the error formula, then the time estimated by the app is 38 minutes and 24 seconds.
What is the error percentage?
The amount of error is expressed as if it is a part of the total which is a hundred. The ratio can be expressed as a fraction of 100. It is represented by the symbol ‘%’.
Given
It took 48 minutes to drive downtown.
An app estimated it would be less.
The error was 20%
Then the error will be
[tex]\begin{aligned} \rm Error \% &= \rm \dfrac{Exact \ value-Approximate \ value }{Exact \ value}*100\\\\20 &= \rm \dfrac{48 - Approximate \ value }{48}*100\\\\9.6 &= \rm 48 - Approximate \ value \\\\\rm Approximate \ value = 38.4\\\\\end{aligned}[/tex]
Thus, the time estimated by the app is 38 minutes and 24 seconds.
More about the error percentage link is given below.
https://brainly.com/question/4170313
