Assuming you know the mean (mu) and the standard deviation (sigma), you would use the raw score (x) to get the z score through this formula
z = (x-mu)/sigma
If you get a positive z value, then the raw score is above the mean. If z is negative, then the raw score is below the mean.
The absolute value of z tells us how far away from the mean we are in terms of standard deviation.
Eg: z = -3 leads to |z| = |-3| = 3, so we're 3 standard deviations below the mean.
Answer:
Step-by-step explanation:Did that help?



That's the exact answer; they usually want a calculator approximation at this point,

Answer:
π/4, 3π/4
Step-by-step explanation:
3tanx = 3
tanx = 1
Basic angle: π/4
x = π/4
x = π + π/4 = 3π/4
In an equilateral triangle the radius of inscribed circle is equal to

, so

and

.
The area of this equilateral triangle is

square units.