Question

Q and R are mutually events. If P(Q)=0.18 and P(R)=0.18 and P(R)=0.2, find P(Q or R).

A)0.036

B)0.344

C)0.380

Answer 1

If P(Q or R) = P( Q) + P(R) then,

0.18 + 0.2 = 0.38

So, P(Q or R) = 0.38

C, 0.380

Answer 2

C

Explanation:

Givens

`P(Q)=0.18\\P(R)=0.2`

The probability function
`P(Q \ or \ R)` indicates the sum of individual probabilities.

`P(Q \or \ R)=P(Q})+P(R)=0.18+0.2=0.38`

Therefore, the right answer is C.

Remember, "or" indicates sum, "and" indicates product.