Question

What are the average marks obtained by all the seven students in Physics? (rounded off to two digit after decimal)

• A. $77.26$
• B. $89.14$
• C. $91.37$
• D. $96.11$

Answer 1

Answer: (B)

$89.14$

Average marks obtained in Physics by all the seven students
$=\frac{1}{7}\times [90$% of $120)+(80$% of $120)+(70$% of $120)+(80$% of $120)+(85$% of $120)+(65$% of $120)+(50$% of $120\left)\right]$
$=\frac{1}{7}\times [90+80+70+80+85+65+50)$% of $120]$
$=\frac{1}{7}\times (520$% of $120]$
$=\frac{624}{7}$
$=89.14$.