Answer:
-1
Step-by-step explanation:
-4.2-(-2.9)
-4.2➡ is about -4
-2.9➡is about -3
-4-(-3)
-4+3
-1
21 * (-1) = -21
21 + (-1) = 20
A. we use the z statistic to solve this problem
z = (x – u) / s
We calculate the value of the sample mean u and standard deviation
s:
u = $30 * 304 = $9120
s = $21 * 304 = $6384
z = (9,600 – 9120) / 6384
z = 0.075
From the normal tables using right tailed test,
P = 0.47
B. At worst 11% means P = 0.11, so the z value at this is
z = -1.23
-1.23 = (x – 9120) / 6384
x = 1267.68
The measure of the interior angles would be 120°, and they would all add up to be 720°
