Question

In a classroom, the probability that the teacher chooses a boy from 20 students is 0.45. How many students are not boys? Describe the likelihood of not choosing a boy.

Answer 1

If:

$\frac{Boys}{20} = 0.45$

Soon:
$\frac{Boys}{20} = 0.45 \to Boys = 20*0.45 \to \boxed{Boys = 9}$

Therefore: (It's not a boy)
Students = 20
Boys = 9
girls = ?

$Girls + Boys = Students$
$Girls + 9 = 20$
$Girls = 20 - 9$
$\boxed{Girls = 11}$

Answer: (Describe the likelihood of not choosing a boy)

$\frac{11}{20} = \boxed{\boxed{0.55}}\end{array}}\qquad\quad\checkmark$