Step-by-step explanation: This simple confidence interval calculator uses a Z statistic and sample mean (M) to generate an interval estimate of a population mean (μ).
Note: You should only use this calculator if (a) your sample size is 30 or greater; and/or (b) you know the population standard deviation (σ), and use this instead of your sample's standard deviation (an unusual situation). If your data does not meet these requirements, consider using the t statistic to generate a confidence interval.
where:
M = sample mean
Z = Z statistic determined by confidence level
sM = standard error = √(s2/n)
As you can see, to perform this calculation you need to know your sample mean, the number of items in your sample, and your sample's standard deviation (or population's standard deviation if your sample size is smaller than 30). (If you need to calculate mean and standard deviation from a set of raw scores, you can do so using our descriptive statistics tools.)
2L + 2W = 116
L = 2W + 10
2(2W+10) + 2W = 6W + 20 = 116
6W = 96
W = 16
L = 2W + 10
L = 2(16) + 10 = 32 + 10 = <u><em>42 cm</em></u>
Answer:
hope this helps you.keep it up..
Answer:
no it's easy u do it your self if u say it's easy
Answer: 36 or sqrt(1296)
Step-by-step explanation:
l * w = a(864)
We can substitute w in this equation for 2/3 * l.
l * (2/3 * l) = 864 or 2/3 * l ^2
Multiply by the denominator 3...
and then divide by what's left of the fraction 2
(864)*3/2 = 1296
1296 = l^2
This can also be seen as:
sqrt(1296) = l
36 = l
