Answer:
Poorly formated. Please fix the question so it is more understandable!
The dot plot below shows the number of books 26 students read in a month:
<span>Is the median or the mean a better center for this data and why? help plz
</span>
We know that
sin²x+cos²x=1
so
clear cos x
cos x=(+/-)√[1-sin²x]
in this problem
<span>Angle 0 is in quadrant 1 -----> cos o and sin o are positive
</span>sin o=2/5
cos x=√[1-(2/5)²]----> cos o=√[1-4/25]----> cos o=√[21/25]---> cos o=√21/5
the answer is
cos o=√21/5
This is supposed to be a question…????
