A, B, Care three sets of values of x: A: 2, 3, 7, 1, 3, 2, 3,
B: 7, 5, 9, 12, 5, 3, 8,
C: 4, 4, 11, 7, 2, 3, 4
Find the mean of A, B and C respectively.

Options

A. 7,5,3
B. 7,3,5
C. 3,7,5
D. 5,3,7

Answer

To find the mean of the sets A, B, and C, we will follow these steps:

### Step 1: Calculate the Mean of Set A
1. **List the values in Set A**: 2, 3, 7, 1, 3, 2, 3
2. **Sum the values**:
\[ 2 + 3 + 7 + 1 + 3 + 2 + 3 = 21 \]
3. **Count the number of observations**: There are 7 values in Set A.
4. **Calculate the mean**:
\[ \text{Mean of A} = \frac{\text{Sum of values}}{\text{Number of observations}} = \frac{21}{7} = 3 \]

### Step 2: Calculate the Mean of Set B
1. **List the values in Set B**: 7, 5, 9, 12, 5, 3, 8
2. **Sum the values**:
\[ 7 + 5 + 9 + 12 + 5 + 3 + 8 = 49 \]
3. **Count the number of observations**: There are 7 values in Set B.
4. **Calculate the mean**:
\[ \text{Mean of B} = \frac{49}{7} = 7 \]

### Step 3: Calculate the Mean of Set C
1. **List the values in Set C**: 4, 4, 11, 7, 2, 3, 4
2. **Sum the values**:
\[ 4 + 4 + 11 + 7 + 2 + 3 + 4 = 35 \]
3. **Count the number of observations**: There are 7 values in Set C.
4. **Calculate the mean**:
\[ \text{Mean of C} = \frac{35}{7} = 5 \]

### Final Results
- Mean of Set A: 3
- Mean of Set B: 7
- Mean of Set C: 5