Question

If the probability of an event is 2/7, what must be the probability of its complement?

Answer 1

Answer:

$\frac{5}{7}$

Step-by-step explanation:

Let

x------->the probability of its complement

we know that

The Complement Rule states that the sum of the probabilities of an event and its complement must equal $1$

so

in this problem

$\frac{2}{7}+x=1$

solve for x

Adds $-\frac{2}{7}$ both sides

$x=1-\frac{2}{7}$

$x=\frac{5}{7}$

Answer 2

Which one is it 5/7 or 2/7