Question

q: a student has scores of 85, 92, 88, and 90 on four tests. what score must the student get on the fifth test for the average (mean) of all five tests to be exactly 90? a. 93 b. 89 c. 90 d. 95

Explanation:

Step1: Calculer la somme des quatre notes existantes

$85 + 92+88 + 90=355$

Step2: Calculer la somme totale souhaitée des cinq notes

$90\times5 = 450$

Step3: Trouver la cinquième note

$450-355 = 95$

Answer:

D. 95