Answer:
57.885
Step-by-step explanation:
For such calculations a probability calculator is very helpful. The one in the attachment shows the 87th percentile to be 57.885.
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A table of the standard normal distribution will tell you the 87th percentile corresponds to a z-value of 1.12639. Then the X value is ...
X = Zσ +μ = 1.12639(7) +50 = 57.885
Answer:
(-2, -3)
(3, 12)
Step-by-step explanation:
To solve this, we're gonna get rid of the y's with substitution
x² + 2x - 3 = 3x + 3
Let's make this equation equal to zero
Subtract 3 from both sides
x² + 2x - 3 = 3x + 3
- 3 - 3
x² + 2x - 6 = 3x
Subtract 3x from both sides
x² + 2x - 6 = 3x
- 3x - 3x
x² - x - 6 = 0
Factor the equation
(x - 3)(x + 2) = 0
This means x can be -2 or 3
Let's solve it with -2 first, plug the new x in y = 3x + 3
y = 3(-2) + 3
y = -6 + 3 = -3
Do the same for x = 3
y = 3(3) + 3
y = 9 + 3 = 12
Answer:
Option B. 8.6%
Step-by-step explanation:
Simple index of two stocks: i=?
i=[(5,000*5.1+2,500*7.45)/(5,000*4.5+2,500*7.25)-1]*100%
i=[(25,500+18,625)/(22,500+18,125)-1]*100%
i=[(44,125)/(40,625)-1]*100%
i=[1.086153846-1]*100%
i=[0.086153846]*100%
i=8.6153846%
i=8.6%
You need to expand the brackets eg.
(w-9)8 basically means 8 x (w-9) = 8w-72
Z: is the number
[Z*(-1)]+(-50)
(-Z)+(-50)
-Z-50
<span>I hope it helps you :)</span>
