Answer:
it's probably ours it's just a lucky guess
Step-by-step explanation:
800(1+7)∧4
it will be $1048.63
90 mins + 50 mins = 140 mins
60 mins ==1 hr 2*60 = 120 mins
140 mins -120 mins= 20 mins
2 hrs ans 20 mins is the answer
Answer:
A
Step-by-step explanation:
The minimum sample size required to estimate the mean usage of water = 2225.07
What is Standard deviation?
In statistics, the standard deviation (SD, also represented by the Greek letter sigma σ or the Latin letter s) is a measure that is used to quantify the amount of variation or dispersion of a set of data values.
We can find the minimum sample size required to estimate the mean usage of water as shown below:
Standard deviation ![\sigma =3.61](https://tex.z-dn.net/?f=%5Csigma%20%3D3.61)
Margin of error E=0.15
Critical value for 95% confidence interval = 1.96
Required minimum sample size: ![n=(\frac{Z_{\frac{\alpha}{2}}.\sigma }{E} )^2](https://tex.z-dn.net/?f=n%3D%28%5Cfrac%7BZ_%7B%5Cfrac%7B%5Calpha%7D%7B2%7D%7D.%5Csigma%20%7D%7BE%7D%20%29%5E2)
![=(\frac{1.96\times 3.61}{0.15} )^2](https://tex.z-dn.net/?f=%3D%28%5Cfrac%7B1.96%5Ctimes%203.61%7D%7B0.15%7D%20%29%5E2)
=2225.07
Hence, the minimum sample size required to estimate the mean usage of water = 2225.07
Learn more about Standard deviation here:
brainly.com/question/22920224
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