Six students in a small class took an exam. The average of their grades was 75. The seventh student in the class was ill that day and took the exam another day. When this student’s score was included, the class average rose to 78. What was the seventh student’s score?
2006-11-02 10:46:15 · 5 answers · asked by Anonymous in Education & Reference ➔ Homework Help
Total marks obtained by 6 students=75*6=450 Total marks obtained by 7 students=78*7=546 Therefore,marks obtained by the 7th, student=546-750=96.
2006-11-02 11:12:58 · answer #1 · answered by alpha 7 · 0⤊ 0⤋
well the average went up three so 78 +3=81
2006-11-02 23:59:22 · answer #2 · answered by copman555 2 · 0⤊ 0⤋
You really ought to do your own homework.
Add up the first six scores and divide by 6 to get 75. That means the six scores added up to 450.
You take it from here.
2006-11-02 18:50:03 · answer #3 · answered by MathGuy 3 · 0⤊ 0⤋
Is it 3...?
2006-11-02 18:49:25 · answer #4 · answered by blue_bandgeek26 3 · 0⤊ 0⤋
the answer is 81
2006-11-02 18:56:26 · answer #5 · answered by josem0808 2 · 0⤊ 0⤋