Q$3.$ Using the figure below $($among others$),$ answer the following questions. $($note that the R$2$ does

not belong to the regression equation$)$

i$.(1$ pt$)$ Calculate the approximate depth of a $50-$year return period event

ii$.(2$ pts$)$ What is the probability that a $100$ mm event will be equaled or exceeded in the next

$75$ years?

iii. $(2$ pts$)$ You are determining risk for a new water resources structure. What return period

event do you have to plan for if you allow for only a $20\%$ risk of exceedance over the next

$25$ years? What is the event size for this event?

I saw this was completed by an expert already, but when i copied his steps i got completely different answers. Please show$/$ talk through steps completely