To calculate the arithmetic mean, you can add up all the values and divide them by the number of items.for the calculation you need the value of sales everyday add them and then divide it by 7 if sunday is included in it or the working days of the week in which sales are done.

Generally average or arithmetic mean Is based on all the observations which is easy and simple to comprehend and calculation

To find the **arithmetic mean** (average) of the sales per day in a fair price shop over a week, follow these steps:

### Step 1: Gather the sales data

Suppose the sales (in units or currency) for each day of the week are as follows:

- Monday: 100 units

- Tuesday: 150 units

- Wednesday: 120 units

- Thursday: 130 units

- Friday: 140 units

- Saturday: 110 units

- Sunday: 160 units

### Step 2: Add the sales data

Now, add the sales for all seven days:

\[

100 + 150 + 120 + 130 + 140 + 110 + 160 = 910 \text{ units}

\]

### Step 3: Divide by the number of days

Since there are 7 days in a week, divide the total sales by 7:

\[

\text{Arithmetic Mean} = \frac{910}{7} = 130 \text{ units per day}

\]

### Conclusion:

The arithmetic mean (or average) sales per day in the shop over the week is **130 units**.

This method can be used for any similar situation where you want to find the average of a set of numbers by adding them together and dividing by the number of values.

hope this helps you!!