Question

the problem says use the data in the following table which lists drive through order accuracy at popular fast food chains assume that orders are randomly selected from those included in the table if one order is selected find the probability of getting an order that is not accurate or is from restaurant C are the events of selecting an order that is not accurate and selecting an order from restaurant C disjoint events? the probability of getting an order from restaurant C or an order that is not accurate is ____

Answer 1

$\text{probability}=\frac{\text{ number of favorable outcomes}}{\text{ total number of outcomes}}$

Let's define the next event:

A: the order is not accurate or is from restaurant C.

number of favorable outcomes = 34 + 52 + 30 + 17 + 246 = 379

total number of outcomes = 34 + 52 + 30 + 17 + 322 + 276 + 246 + 150 = 1127

Then, the probability that event A occurs is:

$P(A)=\frac{379}{1127}\approx0.336$

The events selecting an order that is not accurate and selecting an order from restaurant C are not disjoint events, because 30 cases from the sample satisfy both criteria at the same time.