A student scored 83 and 91 on her first two quizzes. Write and solve a compound inequality to find the possible values for a third quiz score that would give her an average between 85 and 90, inclusive. A student scored 83 and 91 on her first two quizzes. Write and solve a compound inequality to find the possible values for a third quiz score that would give her an average between 85 and 90, inclusive. @Mathematics

Question

campbell_st · Answer

so you need to some values 

  mean of 85    (83 +91 +x)/3 = 85  

solve for x. Thie will be the lowest score needed for a anverage between 85 & 90

mean of 90     (83 + 91 +x)/3 = 90

solve for x This is the highest score needed

so the score will need to be between these values..

hope this helps