Question 183041
Remember, the average of "x" scores is simply the sum of those scores over "x". 



In this case, we have the scores: 88,78,86, and 100



So add them up and divide them by 4 (the number of scores present)



{{{A=(88+78+86+100)/4=352/4=88}}}



So if you receive a perfect score on the final exam, you will get an 88.



Since {{{88<90}}}, this means that it is NOT possible to get an A.