The following is a set of data from a sample of n = 6: 7             4             9             7             3             12 a. Compute the mean, median, and mode. b. Compute the range,...

Let us start with the first question, I.e. a part
a. In a part we have to calculate mean, median and mode.
To do this we will first arrange our data set in ascending order.
Data set in ascending order = 3 4 7 7 9 12.
The mean of a data set is equal to the average value = Σ xi/n
Where n= no. Of values
Therefore mean = (3+4+7+7+9+12)/6
= 7
Median = (3rd term + 4th term)/2
= (7+7)/2
= 7
Mode = value which appears most frequently
In this set 7 appears most frequently therefore mode = 7
b. Range...