Task $3$: Accident frequency

$3$ The table below shows Contritum's accident history over the past $3$ years.

$\backslash$table$[[$Year$,2021,2022,2023],[\backslash$table$[[$Number of$],[$workers$]],1000,1500,2000],[\backslash$table$[[$Number of$],[$accidents$]],90,150,225],[\backslash$table$[[$Number of$],[$hours worked$]],2000000,3000000,4000000],[\backslash$table$[[$Days lost due to$],[$accidents$]],155,225,560]]$

$($a$)$ Calculate the accident frequency rate for EACH of the $3$ years.

Show your calculations at EACH step.

$($b$)$ Based on the information in the table and the calculated accident rate, what conclusions can be drawn?

$($c$)$ What are the possible limitations of the data in this table?