What will be the value of 3.725 after rounding off to three significant digits?

Options

A. `3.73`
B. `3.72`
C. `3.71`
D. None of these

Explanation

To round off the number 3.725 to three significant digits, follow these steps:

### Step 1: Identify the significant digits
The number 3.725 has four significant digits: 3, 7, 2, and 5. We need to round it to three significant digits.

### Step 2: Determine the digit to round
To round to three significant digits, we look at the first three digits: 3, 7, and 2. The next digit (the fourth digit) is 5.

### Step 3: Apply rounding rules
According to rounding rules:
- If the digit following the last significant digit (in this case, the fourth digit, which is 5) is 5 or greater, we round up the last significant digit.
- If it is less than 5, we leave the last significant digit unchanged.

### Step 4: Round the number
Since the fourth digit is 5, we round up the last significant digit (2) by 1. Thus:
- 2 becomes 3.

### Step 5: Write the final rounded number
So, 3.725 rounded to three significant digits is 3.73.

### Final Answer:
**3.73**

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