Answer:
25%
Step-by-step explanation:
Total= 40 students
boys +girls= 40
30 +girls= 40
number of girls
= 40 -30
= 10
Percentage of girls

Alternatively,
percentage of girls
= 100% -(percentage of boys)

Answer:
z = 74 degrees
y = 115 degrees
Step-by-step explanation:
Explanation in the attachment.
Answer:
mean = 33/6 =5.5
Step-by-step explanation: