To find the probability of getting an order that is not accurate, we need to calculate the ratio of the total number of "not accurate" orders to the total number of orders.

Step 1: Sum the "not accurate" orders

The "not accurate" orders for each restaurant are:

• Restaurant A: 37
• Restaurant B: 55
• Restaurant C: 40
• Restaurant D: 13

Total "not accurate" orders = $37 + 55 + 40 + 13 = 145$

Step 2: Sum the total number of orders

The total number of orders (both accurate and not accurate) for each restaurant is:

• Restaurant A: $317 + 37 = 354$
• Restaurant B: $275 + 55 = 330$
• Restaurant C: $237 + 40 = 277$
• Restaurant D: $139 + 13 = 152$

Total number of orders = $354 + 330 + 277 + 152 = 1113$

Step 3: Calculate the probability

The probability of selecting a "not accurate" order is the ratio of "not accurate" orders to the total number of orders:

$P(\text{not accurate}) = \frac{145}{1113}$

Now, let's simplify this fraction.

$P(\text{not accurate}) \approx 0.1303$

So, the probability of getting an order that is not accurate is approximately 0.1303, or 13.03%.

Would you like more details on the steps? Here are five related questions to expand on this concept:

1. What is the probability of getting an accurate order instead?
2. If two orders are selected at random, what is the probability that both are accurate?
3. How would the probability change if Restaurant D increased its accurate orders?
4. What is the combined probability of getting a not accurate order from Restaurants A or B?
5. How does the accuracy rate vary across restaurants?

Tip: Probability is always a number between 0 and 1, where 0 means impossible and 1 means certain.