The area 0.00625 of variables 0 to 5 is calculated in terms of 5 divided by 800. 5 represents the number of variables while 800 for all variables involved. If we calculate the density curve from 5 to 800, this represents 795 variables. Then we need to divide 795 by 800 to get the remaining area of the density curve. This results to 0.99375, which is the are of the density curve from 5 to 800. Adding 0.00625 and 0.99375 will give a value of 1.
First we find the value of . This is quite simple as it's a right angled triangle with one of the angles already given. The main concept is vertically opposite angles meaning if 2 lines intersect, the opposite 2 angles are equal.
So the angle is for the interior of the triangle too. Now due to angle sum postulate,
Simplify this and you get:
Hence,
Now, we need to find the value of angle which is which is basically when we replace with .
Henceforth, angle is equal to so option is correct. :D