An operator records the time (rounded to the nearest second) required to complete a mechanical assembly. The results you get are the following.
seconds 30 31 32 33 34 35 36 37 38 39
# assembly 3 5 6 9 12 25 32 15 9 6
Suppose the times required to assemble two parts are recorded. Determine the range of each of the following random variables.
a) the total time of assembly of two pieces
b) the average assembly time of two pieces
c) the difference in assembly time of two pieces
d) the greater assembly time of the two pieces