Question

At a pizza shop, 75% of the customers order pizza, 20% of the customers order salad, and 15% of the customers order a pizza and a salad. If a costumer isn’t chosen at random, what is the probability that he or she orders either a pizza or salad?

Answer 1

better probability of them getting pizza

Answer 2

The probability that he or she orders either a pizza or salad is 80%.

Explanation:

Given : At a pizza shop, 75% of the customers order pizza, 20% of the customers order salad, and 15% of the customers order a pizza and a salad. If a costumer isn’t chosen at random.

To find : What is the probability that he or she orders either a pizza or salad?

Solution :

Let A be the event that customer order Pizza

Let B be the event that customer order Salad

75% of the customers order pizza,

P(A)=75%=0.75

20% of the customers order salad,

P(B)=20%=0.20

15% of the customers order a pizza and a salad,

`P(A\cap B)=15%=0.15`

Now, The probability that he or she orders either a pizza or salad

`P(A\cup B)= P(A)+P(B)-P(A\cap B)`

`P(A\cup B)= 0.75+0.20-0.15`

`P(A\cup B)= 0.95-0.15`

`P(A\cup B)= 0.80`

Therefore, The probability that he or she orders either a pizza or salad is 80%.