Question

could you write the mark not percentage i will mark you as brainliest

Answer 1

No. of students in the class = 30

No. boys = 20

No. of girls= 30 -20 = 10

Mean mark of the boys = 62%

Mean marks of the class = 70%

$\sf {Mean\ marks\ of\ girls\ }\\\\\\\sf {20 \times 62 + 10x = 30 \times 70}\\\\\sf {1240 + 10x = 2100}\\\\\sf {10x = 2100 - 1240}\\\\\sf {10x = 860}\\\\\sf {x = \frac{860}{10}}\\\\\sf {x = 86}$

Answer 2

Answer:

The mean of 18 girls students is 1.48

Step-by-step explanation:

• pls mark as brainliest