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To solve the problem of finding the mean number of items bought by each customer, we need to calculate the total number of items bought over both days and divide it by the total number of customers.

The table provides the following information:

- For **Saturday**, the number of customers and items bought are:
  - 1 customer bought 5 items.
  - 2 customers bought 4 items each.
  - 3 customers bought 2 items each.
  - 4 customers bought 3 items each.

- For **Sunday**, the number of customers and items bought are:
  - 1 customer bought 7 items.
  - 2 customers bought 3 items each.
  - 3 customers bought 5 items each.
  - 4 customers bought 1 item each.

Now let's calculate the total items bought:

### Saturday:
- \( 1 \times 5 = 5 \)
- \( 2 \times 4 = 8 \)
- \( 3 \times 2 = 6 \)
- \( 4 \times 3 = 12 \)

**Total for Saturday** = \( 5 + 8 + 6 + 12 = 31 \) items

### Sunday:
- \( 1 \times 7 = 7 \)
- \( 2 \times 3 = 6 \)
- \( 3 \times 5 = 15 \)
- \( 4 \times 1 = 4 \)

**Total for Sunday** = \( 7 + 6 + 15 + 4 = 32 \) items

### Total number of items over both days:
- \( 31 + 32 = 63 \) items

### Total number of customers:
- \( 1 + 2 + 3 + 4 = 10 \) customers each day, for two days: \( 10 + 10 = 20 \) customers

### Mean number of items bought:
The mean is calculated as:
\[
\text{Mean} = \frac{\text{Total number of items}}{\text{Total number of customers}} = \frac{63}{20} = 3.15
\]

So, the mean number of items bought by each customer is **3.15**.

Would you like more details or have any questions about this?

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Here are 5 related questions to expand your understanding:

1. How do you calculate the mean for grouped data?
2. Can the mean ever be a number that isn't in the data set?
3. What is the difference between the mean and the median in data sets?
4. How would the result change if the number of customers was different on both days?
5. What does the mean tell us about the overall shopping pattern?

**Tip:** Always double-check your calculations for accuracy, especially when handling grouped data!

Maryam recorded the number of items bought by each customer in a clothes shop over two days. Her results are shown in the table below. Work out the mean number of items bought by each customer. Give your answer as a decimal.

Learn how to calculate the mean number of items bought by customers from a data table. In this problem, we find the mean by dividing the total number of items bought by the total number of customers over two days. Suitable for students in Grades 5-7.

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