What is the average of 36, 43, 51, 68 and 77?

Options

A. 47
B. 49
C. 55
D. 64

Answer

To find the average of the numbers 36, 43, 51, 68, and 77, we can follow these steps:

### Step 1: Write down the numbers
The numbers we need to find the average of are:
- 36
- 43
- 51
- 68
- 77

### Step 2: Calculate the sum of the numbers
Now, we will add these numbers together:
\[ 36 + 43 + 51 + 68 + 77 \]

Calculating step by step:
- First, add 36 and 43:
\[ 36 + 43 = 79 \]
- Next, add 51:
\[ 79 + 51 = 130 \]
- Then, add 68:
\[ 130 + 68 = 198 \]
- Finally, add 77:
\[ 198 + 77 = 275 \]

So, the sum of the numbers is:
\[ 275 \]

### Step 3: Count the number of observations
We have a total of 5 numbers:
- 36
- 43
- 51
- 68
- 77

So, the number of observations is:
\[ 5 \]

### Step 4: Calculate the average
Now, we can use the formula for average:
\[ \text{Average} = \frac{\text{Sum of the numbers}}{\text{Number of observations}} = \frac{275}{5} \]

Calculating this gives:
\[ \frac{275}{5} = 55 \]

### Final Answer
The average of the numbers 36, 43, 51, 68, and 77 is:
\[ \boxed{55} \]

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