Question

In MMW class, a student’s quiz scores are 89, 92, 82, and 77. What score does the student need on the fifth quiz to have a mean quiz score of 85? All the quizzes have equal weights. Round your answer to the nearest whole number.

Answer 1

$$\mu=\dfrac{89+92+82+77+x}{5}=85$$

$$340+x=425$$

$$x=85$$

A student’s fifth quiz scores is 85.