$12.$ AdventureLand theme park recently received a large number of complaints from customers who had endured delays while waiting to ride on AdventureLand$$s largest rollercoaster, Monster Train. As newly appointed operations manager, you are considering the problem of delayed rides on Monster Train. By observing $150$ delayed Monster Train rides over a $12$ week period, you find that a variety of factors are contributing to the Monster Train delay problem. You summarize the results of your study in a diagram:

MONSTER TRAIN OPERATION

RIDE DELAY

WAITING AREA PERSONNEL

You also create this table to tally the frequency with which you observed various causes of delay:

Problem Areas Number of Occurrences

Delayed availability of safety inspector $2$

Mechanical failure of turnstile $17$

Broken gearing mechanism requiring repair $15$

Staff arrive late for work $43$

Bad weather $2$

Insufficient staff to load passengers $21$

Please answer the following questions, based on this information.

a$.$ Pareto analysis would suggest that AdventureLand theme park focus on which two Monster Train problem areas first? $(2$ points$)$

b$.$ Insufficient Staff to load passengers is categorized in the fishbone diagram under what main heading? $(1$ point$)$