Answer:
324
Step-by-step explanation:
The z score for a confidence level of 99% is 2.575.. You need to know this to complete this type of problem.. the other two commonly used confidence levels are 90% and 95% having z scores of 1.645 and 1.96 respectively. You need to memorize this!
To find the confidence interval, it will be defined as the sample mean plus/minus the margin of error.. Now to find the margin of error, divide the standard deviation of 12 by the square root of the number of elements in your sample(√250). Then take that result and multiply it by the Z score I mentioned above for a 99% confidence level.
In this case: the sample mean is 70 and the margin of error is approximately 1.95
So to calculate the confidence interval, do the following:
70 - 1.95 = 68.05 rounded to the nearest whole number is 68
70 + 1.95 = 71.95 rounded to the nearest whole number is 72
Looks like that would be the last choice. hope this helps.. it's been awhile since my work with statistics :-)
For this case, what you should do is apply the Pythagorean theorem to find the distance of the blue linear.
We have then:
h = root ((5) ^ 2 + (8) ^ 2)
h = 9.433981132
h ^ 2 = 89
Answer:
he is 89 units ^ 2 from the woman or 9.433981132 units.
B.89
D. 89
Answer:
37.5%
Step-by-step explanation:
40-x%*40=25
x%40=15
x%=15/40=37.5%
