The question lists some parameters and ask to know which of the listed parameters is for all values in the data. We answer by the following;
Interquartile range- the interquartile range is simply the difference between the upper quartile and the lower quartile. It does not work for all values in the dataset so
It cannot be the answer.
The minimum is the minimum value in the dataset. It is the smallest in value. It does not work for all values in the dataset.
The maximum is the number with the highest value. It does not work for all the values in the dataset
Mean is correct, all the values in the dataset are used to calculate the mean value
