2(4x+1) = 3x - 6x
8x + 2 = 3x - 6x
8x + 2 = -3x
-8x -8x
2 = -11x
————
-11 -11
x = -0.18
The two values are positive 9 and negative 9
Answer:
The 99% confidence interval for the fraction of U.S. adult Twitter users who get some news on Twitter is between 49.34% and 60.66%, which means that we are 99% sure that the true percentage of US adult Twitter users who get some news is in this interval.
Step-by-step explanation:
Confidence interval:
A confidence interval has the following format:
In which M is the sample mean, z is related to the confidence level and s is the standard error.
55% of U.S. adult Twitter users get at least some news on Twitter (Pew, 2013). The standard error for this estimate was 2.2%.
This means that
99% confidence level
So , z is the value of Z that has a pvalue of , so .
Lower bound of the interval:
Upper bound:
The 99% confidence interval for the fraction of U.S. adult Twitter users who get some news on Twitter is between 49.34% and 60.66%, which means that we are 99% sure that the true percentage of US adult Twitter users who get some news is in this interval.
Answer:
.3 feet
Step-by-step explanation:
3.8 - 3.5 = .3
45x5 = 225 minutes a week
225 x 12 = 2700 minutes in 12 weeks
2700 / 60 = 45 hours
1800 / 45 = 40 laps per hour
answer: average 40 laps per hour