SAT scores of students at an Ivy League college are distributed with a standard deviation of 250 points. Two statistics students
, Raina and Luke, want to estimate the average SAT score of students at this college as part of a class project. They want their margin of error to be no more than 25 points.(a) Raina wants to use a 90% condence interval. How large a sample should she collect?Raina should sample at least people.
1 answer:
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Easy peasy
the midpoint between
and 
is
just average them
so given that (3,5) is the midpoint of (-4,5) and (x,y)
so by logic
and 
times both sides by 2 for everybody
-4+x=6 and 5+y=10
add 4 to both sides for left one and minus 5 from both sides for right
x=10 and y=5
the coordinate of point C is (10,5)
the x coordinate is 10
the midpoint between
just average them
so given that (3,5) is the midpoint of (-4,5) and (x,y)
so by logic
times both sides by 2 for everybody
-4+x=6 and 5+y=10
add 4 to both sides for left one and minus 5 from both sides for right
x=10 and y=5
the coordinate of point C is (10,5)
the x coordinate is 10