6^2 is rational because it equals 36 which is a rational number.
Answer: -1
Step-by-step explanation:
First change tan(315) to:
Then evaluate the sine and cosine function. What is the y component of 315 degrees? What is the x component of 315 degrees?
N^2 +3n+6 / n (as a fraction)
The given expression is:
When r=6 and s=2, we need to replace those values into the expression and solve:
The answer is a. 25
Answer:
The minimum sample size needed is 125.
Step-by-step explanation:
In a sample with a number n of people surveyed with a probability of a success of , and a confidence level of , we have the following confidence interval of proportions.
In which
z is the zscore that has a pvalue of .
The margin of error is:
For this problem, we have that:
99% confidence level
So , z is the value of Z that has a pvalue of , so .
What minimum sample size would be necessary in order ensure a margin of error of 10 percentage points (or less) if they use the prior estimate that 25 percent of the pick-axes are in need of repair?
This minimum sample size is n.
n is found when
So
Rounding up
The minimum sample size needed is 125.