Answer:
x = 4 or -3
Step-by-step explanation:
= x
To get rid of the square root, we need to square both sides.
x + 12 = x²
Get all variables/ integer on to one side.
0 = x² - x - 12
Use any method to solve this quadratic equation. I'm going to use the completing the square method.
12 = x² - x
12 + 0.25 = x² - x + 0.25
=
±3.5 = x - 0.5
x = 0.5 ± 3.5
x = 4 or -3
Let denote the cumulative distribution function for the standard normal distribution (mean 0, standard deviation 1). Then you're looking for <em>z</em> such that
(a)
(b)
(c)
To get the corresponding <em>z</em>-score for each of 0.70, 0.40, and 0.25, take the inverse CDF of both sides:
(a)
(b)
(c)