$$ The picture is part A also need help with additional questions

B$.$ develop a relative frequency, distributing using the classes in part A

$0-4$

$5-9$

$10-14$

$15-19$

$20-24$

Total $=$

if required round your answer to $2$ decimals

C$.$ Develop a relative cumulative frequency distribution using the classes in part A

$0-4$

$5-9$

$10-14$

$15-19$

$20-24$

D$.$

Develop a cumulative relative frequency, distribution using the classes in part A if required on your answers to $2$ decimals

$0-4$

$5-9$

$10-14$

$15-19$

$20-24$

E$.$ What proportion of customers need an oil change to wait nine minutes or less $($

this one has to be a percentage$)$