Answer:
Step-by-step explanation:
Using the formula
p +/- z* √(p(1-p) / n)
Where p is sample proportion = 3226/3957 = 0.8153, n = 3957 and z* is 2.576
0.8153 + (2.576 √(0.8153(1-0.8153) / 3957))
0.8153 + (2.576 √ (0.8153(0.1847) /3957)
0.8513 + (2.576 √(0.1572/3957)
0.8513 + (2.576 √0.00003974)
0.8513 + 2.576(0.0063)
0.8513 + 0.016
0.8670 ~ 87%
For the lower interview
0.8513 - 0.016
= 0.8353 ~ 84%
Thus, at 99% confidence interval is 84% and 87%
The answer is C because my friend has told me it.
8 can't be square rooted as an integer. Therefore the answer can only result in a being a decimal, in double brackets or it can be a trick question.
Answer:
x=-2
Step-by-step explanation:
-2x-7=3(4x+7)
distribute
-2x-7 = 3*4x +3*7
-2x-7 = 12x+21
add 2x to each side
-2x-7+2x = 12x+2x+21
-7 = 14x+21
subtract 21 from each side
-7-21 = 14x+21-21
-28 = 14x
divide by 14
-28/14 = 14x/14
-2 =x