Question

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In a math class there are five equally weighted tests. A student has grades of
94, 92, 78, and 97 on the first four tests. To earn an A in the class, the students
must have an average of at least 90. What must the student get on the fifth test
to earn an A in the math class?

Answer: The student needs at least an 89 on the fifth test to earn an A in the math
class.

Answer 1

Answer:

Step-by-step explanation:

$Avg = \frac{sum}{total}$

From the problem statement, the average needs to be $90$, the total number of students is $5$, and the sum is $94 + 92 + 78 + 97 + x$, where $x$ is the grade the final student gets.

$90 = \frac{94 + 92 + 78 + 97 + x}{5}$

$450 = 94 + 92 + 78 + 97 + x$

$450 = 361 + x$

$x = 89$