What types of Functions will left endpoint lead to an under approximation and right endpoints lead to and over approximation?
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Easy, using 
to find the intercept:
=
=3
This is your slope. m=3
To find y=mx+b form
-4=3(-1)+b
-4=-3+b
-1=b
y=3x-1 in y=mx+b form
This is your slope. m=3
To find y=mx+b form
-4=3(-1)+b
-4=-3+b
-1=b
y=3x-1 in y=mx+b form
Group A
Money spent by Person 1 = £500
Money spent by Person 2 = £600
Money spent by Person 3 = £900
Money spent by Person 4 = £450
Sum of money spent by group A = £2,450
Average money spent by group A =
⇒ Average money spent by group A = £612.5
Group B
Money spent by Person 1 = £700
Money spent by Person 2 = £500
Money spent by Person 3 = £680
Money spent by Person 4 = £500
Sum of money spent by group B = £2,380
Average money spent by group B =
⇒ Average money spent by group B = £595
Hence, Group B had lower average spend.