Answer: c. 83.3
Step-by-step explanation:
The given data set ={79, 42, 86, 103, 79, 111}
We know that the mean of a data set is given by :-
[tex]\text{Mean}=\frac{\text{sum of all elements in the data set }}{\text{number of all elements in the data set}}[/tex]
[tex]\Rightarrow\ \text{Mean}=\frac{79+42+86+103+79+111}{6}\\\\\Rightarrow\text{Mean}=\frac{500}{6}\\\Rightarrow\text{Mean}=83.3333\approx83.3[/tex]
Hence, the mean of the given data set = 83.3
