Let's break down the problem from the image you uploaded:

We are given a set of dataLet's break down the problem from the image you uploaded:

We are given a set of 6, 10, 11, 15, 23.

Part (a): Calculate the mean:

The mean (average) is found by adding up all the values and dividing by the number of values.

1. Add the values:
   $6 + 10 + 11 + 15 + 23 = 65$

2. Divide by the number of data points (which is 5):
   $\text{Mean} = \frac{65}{5} = 13$

So, the mean is 13.

Would you like help with parts (b) and (c)? Also, here are some related questions that might expand your understanding:

1. What happens to the mean if one of the data points increases?
2. How is the mean different from the median?
3. How would you calculate the weighted mean for a similar data set?
4. What does it mean if a set of data has multiple modes?
5. How does the range of a data set relate to the mean?

Tip: Always double-check that the total count of data points is accurate when calculating the mean, especially when working with larger data sets.