Question

3 red pens, 9 blue pens, 8 green pens
What is the probability of picking a blue? In a decimal

Answer 1

There are a total of 20 pens. There are 9 blue pens out of 20 total pens. In decimal format, you have a chance of 0.45 chance. I hope this helps!

Answer 2

$|\Omega|=20\\ |A|=9\\\\ P(A)=\dfrac{9}{20}=0.45$