Answer:
567+(6673)- 718)+ 012
Step-by-step explanation:
Answer: 37
Step-by-step explanation:
As per given description in the question, we have
Population standard deviation : ![\sigma=2.6\text{ miles per gallon}](https://tex.z-dn.net/?f=%5Csigma%3D2.6%5Ctext%7B%20miles%20per%20gallon%7D)
Critical value for 98% confidence interval = ![z_{\alpha/2}=2.33](https://tex.z-dn.net/?f=z_%7B%5Calpha%2F2%7D%3D2.33)
Margin of error : E= 1 mile per gallon
Formula we use to find the sample size :
![n=(\dfrac{z_{\alpha/2}\cdot \sigma}{E})^2](https://tex.z-dn.net/?f=n%3D%28%5Cdfrac%7Bz_%7B%5Calpha%2F2%7D%5Ccdot%20%5Csigma%7D%7BE%7D%29%5E2)
i.e. ![n=(\dfrac{(2.33)\cdot(2.6)}{1})^2](https://tex.z-dn.net/?f=n%3D%28%5Cdfrac%7B%282.33%29%5Ccdot%282.6%29%7D%7B1%7D%29%5E2)
![\Rightarrow\ n=36.699364\approx37](https://tex.z-dn.net/?f=%5CRightarrow%5C%20n%3D36.699364%5Capprox37)
Therefore , the number of automobiles should be used in the test =37
Answer:
40π cm2/ min.
Step-by-step explanation:
First, we should begin with an equation we know relating the area of a circle, the pool, and its radius: A=πr2.