Answer:
c) .22
Step-by-step explanation:
We have that to find our
level, that is the subtraction of 1 by the confidence interval divided by 2. So:

Now, we have to find z in the Ztable as such z has a pvalue of
.
So it is z with a pvalue of
, so 
Now, find the margin of error M as such

In which
is the standard deviation of the population and n is the size of the sample.
In this question:

Then



15x2+10x-9x+7
8x3+20x2+3x+12
11x4+4x2-6x2-16
Hope this helps !!
Answer:
27!!! I understand it!
Step-by-step explanation:
Monday: 1 , 2 (Anthony and his 2 friends)
They EACH invited two friends!
Tuesday: Anthony: 2 Friend 1: 2 Friend 2: 2
The same!!
Wednesday: A: 2 F1: 2 F2: 2
THE SAME AGAIN!
Thrusday: A: 2 F1: 2 F2: 2
THE SAME AGAIN!!
Friday: A: 2 F1: 2 F2: 2
1 + 2 + 2 + 2 + 2 + 2 + 2 + 2 + 2 + 2 + 2 + 2 + 2 + 2 = 27
Hope it helps!!
Please be kind to mark Brainliest
Thanks!!! ☺
I believe that the answer is 90x+27