Question

What is the probability that a randomly chosen student prefers rap or sings in the shower 3-4 times a week

Answer 1

The equation for the probability that student sings or rap in the shower 3-4 times a week is,

$P\text{ (sing or rap)=P(sings) + P(rap) - P(Sings and rap)}$

Substitute the values in the equation to determine the probability hat student sings or rap in the shower 3-4 times a week.

$\begin{gathered} P\text{ (sings or rap)=0}.4+0.5-0.2 \\ =0.9-0.2 \\ =0.7 \end{gathered}$

So answer is 0.7.