Answer asap plsss and thank you

how pencils and cell phones are the same is that

pencils you can write letters.

you can also erase stuff on the letter

with cell phones you type up a letter and send it

you can also erase the text

what makes pencils and cell phones the same is that you can write and erase.

Explanation:

answer; i believe the correct answer is (4) flip a coin as each participant arrives,heads indicates assignment to the first group: tails indicates assignment to the second group;