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Mathematics 9 Online
OpenStudy (anonymous):

help please :(

OpenStudy (anonymous):

actually help isn't needed I just want to make sure my answer is correct 26 not enough information is given 56 34

OpenStudy (anonymous):

I think the answer is B because we don't have anymore info right?

OpenStudy (here_to_help15):

do u need my help :P

OpenStudy (anonymous):

if you could help that would be great

OpenStudy (here_to_help15):

x=26 : ) just worked it out now :p

OpenStudy (anonymous):

wait how?

OpenStudy (here_to_help15):

By knowing that the diagonals of a rhombus are each other's perpendicular bisectors, we conclude that they intersect at right angles. So, angle WSX has measure 90 degrees. So, we solve 3x+12=90 for x, which gives us x=26.

OpenStudy (here_to_help15):

is that all : P

OpenStudy (anonymous):

OH! okay! thank you!/

OpenStudy (anonymous):

do you think you can help me with another one?

OpenStudy (here_to_help15):

yeah sure : )

OpenStudy (anonymous):

The time required to finish a test in normally distributed with a mean of 80 minutes and a standard deviation of 15 minutes. What is the probability that a student chosen at random will finish the test in more than 110 minutes? 16% 34% 82% 2% if you can't it's okay i'll post it up.

OpenStudy (anonymous):

i have no idea how to do normal distribution

OpenStudy (here_to_help15):

ok : P

OpenStudy (anonymous):

which i think that's what's happening here

OpenStudy (here_to_help15):

no i cant srry : (

OpenStudy (anonymous):

thats okay :)

OpenStudy (here_to_help15):

@hero plz help

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