Question

So far in math class, a student's quiz scores are 86%, 82%, 72%, and 69%. What score does the student need on the fifth quiz to have a mean quiz score of 79%? All the quizzes have equal weights. a 86% b 77.25% c 79% d 87%

Answer 1

Answer:

a

Step-by-step explanation:

the mean = $\frac{total score}{count}$

let the fifth score be x and count = 5, hence

$\frac{86+82+72+69+x}{5}$ = 79 ( multiply both sides by 5 )

309 + x = 395 ( subtract 309 from both sides )

x = 86

the student requires a score of 86% → a