Question

13,18,13,14,13,16,14,21,13 find the mean of the data

Answer 1

To find the mean of the data set \( 13, 18, 13, 14, 13, 16, 14, 21, 13 \), follow these steps:

1. **Sum all the numbers**:
\[
13 + 18 + 13 + 14 + 13 + 16 + 14 + 21 + 13 = 13 + 18 + 13 + 14 + 13 + 16 + 14 + 21 + 13 = 13 \times 5 + 18 + 14 + 16 + 21
\]
- \( 13 \times 5 = 65 \)
- \( 65 + 18 + 14 + 16 + 21 = 65 + 69 = 134\)

So, the total sum is \( 134 \).

2. **Count the number of values in the data set**:
There are \( 9 \) values.

3. **Calculate the mean**:
\[
\text{Mean} = \frac{\text{Sum of the values}}{\text{Number of values}} = \frac{134}{9} \approx 14.89
\]

Therefore, the mean of the data set is approximately \( 14.89 \).