An air$-$conditioning repair department manager has compiled data on the primary reason for $41$ service calls during the previous week.

Job Number Problem$/$

Customer Type Job Number Problem$/$

Customer Type Job Number Problem$/$

Customer Type

$301$ W$/$C $315$ W$/$C $329$ N$/$R

$302$ O$/$C $316$ N$/$C $330$ W$/$R

$303$ O$/$R $317$ O$/$R $331$ F$/$R

$304$ W$/$R $318$ N$/$R $332$ N$/$C

$305$ W$/$C $319$ O$/$C $333$ F$/$R

$306$ F$/$R $320$ F$/$C $334$ W$/$R

$307$ W$/$C $321$ N$/$C $335$ W$/$C

$308$ F$/$R $322$ O$/$C $336$ N$/$R

$309$ O$/$R $323$ F$/$R $337$ N$/$R

$310$ N$/$R $324$ F$/$C $338$ F$/$R

$311$ N$/$R $325$ F$/$R $339$ O$/$R

$312$ O$/$C $326$ F$/$C $340$ F$/$R

$313$ F$/$R $327$ F$/$C $341$ O$/$C

$314$ F$/$R $328$ N$/$R

Key to Problem $2$ table

Problem type:

N $=$ Noisy

F $=$ Equipment failure

W $=$ Runs warm

O $=$ Odour

Customer type:

C $=$ Commercial customer

R $=$ Residential customer

a$.$ Using the data, make the check sheet for the problem types for each customer type.

Check sheet:

Equipment Problem

Customer Type Noisy Failed Odour Warm Totals

Residential

Commercial

Totals

b$.$ Select the Pareto chart for the above data.

Residential Customers Commercial Customers

Pareto Chart A

picture

picture

Pareto Chart B

picture

picture

Pareto Chart C

picture

picture

multiple choice

Pareto Chart A

Pareto Chart B

Pareto Chart C