Step-by-step explanation:
hi im not sure it's right it was kinda confusing
Answer:
91/60
1.516
1 31/60
Step-by-step explanation:
comment how it helps
Answer:
We need a sample size of at least 650
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 problem:
We need a sample of size at least n
n is found when 
So






Rounding up
We need a sample size of at least 650
Answer:
22
Step-by-step explanation:
Answer:
7/50 (also 18% if u need it)
Step-by-step explanation:
18/100 ----- 7/50
Hope this helps!