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probability was never my strong point, but I could take a guess at this.

you guys have any ideas of how to go about solving this?

\[p(wp)=p(wp|Gs1).P(Gs1)+p(wp|Gs2).P(Gs2)\]

p(wp|Gs1)=80% p(wp|Gs2)=35% p(Gs1)=75% P(Gs2)=90%

is the periods in between multiplications symbols? @RaphaelFilgueiras

tihs is the probability of win a point if she gets first server

a player is allowed two serves each time in tennis. sorry i forgot to mention that.

the secons time Gs2

P(wp) is the probability to win a pint

that formula take accounting the two cases,its impossible she gain a ponit without serving

have you played tennis before?

or know how the serving works?

oh ok. the problem also says draw a tree diagram. i will post here.

nope.

|dw:1334986543479:dw|

|dw:1334997467614:dw|

try mulitplying the circled numbers together, then the squared ones, then adding them together,.

ok, that makes alot more sense. thanks for help! really aprreciate it

i got 67.8%