Answer:
A) 1:1
Step-by-step explanation:
Each leg is the same value and the hypotenuse is
of the value.
Answer:
A sample size of 128 is needed.
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(square root of the variance) and n is the size of the sample.
How large should a sample be if the margin of error is 1 minute for a 93% confidence interval
We need a sample size of n, which is found when
. We have that
. So





Rounding up
A sample size of 128 is needed.
-7(-1) - 2 (2)^3 + 1(-3)
7 - 2(8) -3
7 - 15 - 3
-8 -3
-11
The answer ia -11.