The average score of 5 students in a test is 75. If the scores of four students are 70, 80, 65, and 90, what is the score of the fifth student?
Show answer & explanation
Correct answer: B
Explanation
Given:
Average marks of 5 students = 75
Marks of four students = 70, 80, 65, 90
Formula:
Average = (Sum of marks) / (Number of students)
Total marks = 75 × 5 = 375
Sum of marks of four students = 70 + 80 + 65 + 90 = 305
Marks of the fifth student = 375 − 305 = 70