## Task 3 - 160513

To determine the average mass of a corn cob from an experimental field, students of a mathematics working group selected and weighed six cobs.

The largest cob had a mass of $850 \mathrm{~g}$, three cobs had a mass of $640 \mathrm{~g}$ each, and two cobs had a mass of $460 \mathrm{~g}$ each.

What was the average mass, in grams, of these six corn cobs?