10th grade Accuracy, precision and percent error worksheet

Accuracy, precision and percent error

Grade 10 Science Worksheet

Circle the best answer, or write your answer on the line.

1. 1.

   Three weighings of a cup of water give 25.2 g, 25.5 g and 25.3 g. What is the mean mass, to 0.01 g, Ari?
2. 2.

   Three weighings of a jar of sand give 98.6 g, 99.1 g and 98.8 g. What is the mean mass, to 0.01 g, Esme?

3. Read this first

   Three groups measure the density of table salt (CRC accepted value 2.17 g/cm³) (example data)

   group	trial 1	trial 2	trial 3
   Group 1	2.16	2.17	2.18
   Group 2	2.3	2.31	2.3
   Group 3	2.05	2.3	2.16

4. 3.

   Using the table, which group is both accurate and precise, Jun?

   • Group 2
   • Group 1
   • Group 3
5. 4.

   Using the table, how would you describe Group 2, Kira?

   • Precise, not accurate
   • Accurate and precise
   • Neither accurate nor precise
6. 5.

   Using the table, why isn't Group 3 precise, Luz?

   • Its trials spread widely
   • It did too many trials
   • Its mean is far from 2.17
7. 6.

   A balance reads 0.20 g with nothing on it. What happens to every mass measured, Milo?

   • They scatter at random
   • Each one reads 0.20 g too low
   • Each one reads 0.20 g too high
8. 7.

   Water in a cylinder is read from above, not at eye level. What error results, Noah?

   • The water evaporates
   • The reading is too high
   • The cylinder stretches a little
9. 8.

   Some water stays stuck inside a cylinder after pouring. What does that do to the poured volume, Pia?

   • More is poured than measured
   • Less is poured than measured
   • The water gets heavier
10. 9.

    How can a group make its results more reliable, Ren?

    • Round each number to the nearest whole number
    • Repeat the trials and average
    • Use just one trial
11. 10.

    Why zero a balance before weighing, Zee?

    • To warm it up
    • To remove a constant offset
    • To make it more sensitive