Kavita obtained 16, 14, 18 and 20 marks (out of 25) in Maths in weekly tests in the month of Jan. 2000, then mean marks of Kavita is

Options

A. 18
B. 16.5
C. 17
D. 17.5

Answer

To find the mean marks of Kavita, we will follow these steps:

### Step 1: Write down the marks obtained by Kavita.
Kavita obtained the following marks in her weekly tests:
- Test 1: 16
- Test 2: 14
- Test 3: 18
- Test 4: 20

### Step 2: Calculate the sum of the marks.
Now, we will add these marks together:
\[ \text{Sum} = 16 + 14 + 18 + 20 \]
Calculating this gives:
\[ \text{Sum} = 68 \]

### Step 3: Count the number of observations.
Next, we need to determine how many tests (observations) there are. Kavita has taken 4 tests:
- Total number of observations = 4

### Step 4: Apply the formula for mean.
The formula for calculating the mean is:
\[ \text{Mean} = \frac{\text{Sum of all observations}}{\text{Total number of observations}} \]
Substituting the values we found:
\[ \text{Mean} = \frac{68}{4} \]

### Step 5: Calculate the mean.
Now, we perform the division:
\[ \text{Mean} = 17 \]

### Conclusion:
Thus, the mean marks of Kavita is **17**.

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