The percentage of 7717 is 129.8%
The answer is 10.
4 a + 5 b when a = 4 and b = - 1.2
The square root of 3 is irrational
<span>Because the closest square number is 5 which results in 52=25 therefor you cannot get the perfect square of 24</span>
Answer:
We need to sample at least 1069 parents.
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.
How many parents do you have to sample?
We need to sample at least n parents.
n is found when
. So






Rounding up
We need to sample at least 1069 parents.