Question

If in a class of 20 students,
5students have scored 76 marks,
7students have scored 77 marks,
8students have scored 78 marks,
Then compute the mean of the class.​

Answer 1

$\huge\purple{Required \: Answer :}$

No. of Students Scoring 76 marks :

• 5

No. of Students Scoring 77 marks :

• 7

No. of Students Scoring 78 marks :

• 8

$mean = \frac{sum \: of \: marks \: scored}{no. \: of \: students}$

Therefore,

$mean = \frac{76 \times 5 + 77 \times 7 + 78 \times 8}{20} \\ = \frac{1543}{20} \\ = 77.15$