Question

For Cynthia's third lab report, she calculated the mass of an object as it slid down an inclined plane. She got the following three masses.

1.20 kg
0.91 kg
1.08 kg

The true mass of the object is 1 kg.

Cynthia's percent error was [blank]−−−−−−%.

Enter your answer as the number that correctly fills in the blank, rounded to two decimal places, like this: 42.53

Answer 1

Percent error: 6.00%

Explanation:

We find the mean of the three masses

Mean = 1.20 + 0.91 + 1.08 / 3

Mean = 1.06 kg

The experimental value of mass is = 1.06 kg

The actual value of mass = 1 kg

The percent error is: (experimental value - actual value/actual value)*100

Percent error : (1.06 - 1 / 1)*100

Percent error: 6.00%

Answer 2

6.33

Explanation:

1. Find the average:

1.20+0.91+1.08 = 3.19

3.19/3 = 1.06333... (aka the Average)

2. Subtract the average by the True mass:

1.06333... - 1 (the True Mass) = 0.06333...

3. Divide answer by the True mass:

[Because when you divide it by the True Mass it's still 0.06333...]

4. Multiply by 100 (to get the percentage)

0.06333 * 100 = 6.333...

5. In result 6.33% is the correct answer.