Question

PLEASE ANSWER ASAP

At the school carnival students guessed how many marbles are in a jar. Marlo guessed 84 when it was actually 80.
What percent of error did Marlo have?

Answer 1

To answer this question, we shall first calculate the margin of error, then subsequently the percentage error.

1. Start by determining the error in Marlo's guess. The error is the difference between Marlo's guess and the actual number of marbles:

Marlo's guess = 84
Actual number of marbles = 80

We subtract the actual number of marbles from Marlo's guess to get the error:

Error = Marlo's guess - Actual number of marbles
Error = 84 - 80

This means that the error is 4.

2. Now, let's calculate the percentage error.
The percentage error is the error divided by the actual number of marbles, then multiplied by 100 to change it into percentage:

Percentage error = (Error / Actual number of marbles) * 100

Substituting the values we have:

Percentage error = (4 / 80) * 100

This implies that the percentage error in Marlo's guess is 5%.

So, Marlo's guess of the number of marbles in the jar had an error of 4 marbles and a percentage error of 5%.

Answer 2

This is how you set up a percent of error proportion:
Amount of error x(Unknown percent)
Actual value = 100(Percents are out of hundreds)


So if you fill it in, it becomes 4 x
80 =100
Cross multiply, 400= 80x.
Solve.
x=5 so percent error is 5%