Fill up the blanks in each of the following:
(a) The mean of first ten natural number is …………………

Answer

To find the mean of the first ten natural numbers, we can follow these steps:

### Step 1: Identify the first ten natural numbers
The first ten natural numbers are:
1, 2, 3, 4, 5, 6, 7, 8, 9, 10.

### Step 2: Calculate the sum of these numbers
To find the mean, we first need to calculate the sum of these numbers. The sum can be calculated as follows:
\[ \text{Sum} = 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 \]

### Step 3: Use the formula for the sum of the first n natural numbers
We can use the formula for the sum of the first n natural numbers, which is:
\[ \text{Sum} = \frac{n(n + 1)}{2} \]
For the first ten natural numbers, \( n = 10 \):
\[ \text{Sum} = \frac{10(10 + 1)}{2} = \frac{10 \times 11}{2} = \frac{110}{2} = 55 \]

### Step 4: Calculate the mean
Now that we have the sum, we can calculate the mean using the formula:
\[ \text{Mean} = \frac{\text{Sum}}{n} \]
Where \( n \) is the number of values (in this case, 10):
\[ \text{Mean} = \frac{55}{10} = 5.5 \]

### Final Answer
The mean of the first ten natural numbers is **5.5**.

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