Katie must take five exams in a math class. If

Liberty Mack

Liberty Mack

Answered question

2022-05-26

Katie must take five exams in a math class. If her scores on the first four exams are 76, 74, 90, and 88, what score must Katie get on the fifth exam for her overall mean to be at least 90?

Answer & Explanation

ol5ick189

ol5ick189

Beginner2022-05-27Added 7 answers

Mean = Sum of the tests divided by the total number of tests
Let x= the 5th test score
M e a n = 76 + 74 + 90 + 88 + x 5 = 90
Solve by first multiplying both sides of the equation by 5:
= 5 ( 76 + 74 + 90 + 88 + x ) 5 = 90 5
=76+74+90+88+x=450
Solve for x:x=450-76-74-90-88=122

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