Answer :
The observed and expected frequencies for Item 2 produced by Plant B will be 12 and 17.3.
What is an observed frequency?
It should be noted that observed frequency simply means counts that are made from experimental data.
Here, the observed frequencies for Item 2 produced by Plant B is 12. The expected frequency will be:
= (15 + 12 + 25)/3
= 52/3
= 17.3
Learn more about observed frequency on:
https://brainly.com/question/238666673