Hylton Smyth comes to the plant to expedite an order. First, the fabricator's $($Pete$\text{'}$s people$)$ must process the part before turning it over to the NCX$10($the robot$),$ which can only process $25$ units per hour. After getting off to a slow start, the fabricators finish strong sending $28$ and $32$ units in the last two hours, respectively. What is the statistical fluctuation?

Question $1$ Select one or more:

a$.$

NCX must wait for the fabricators to send the first group of $25$ units over.

b$.$

Though the fabricators complete on average $25/$hour$,$ they couldn't supply $25/$hour for the first two hours.

c$.$

The shop steward had to order the fabricators to return from lunch early.

d$.$

Hilton Smyth had to send a truck at $5$ pm for the delivery