Answer: 40%
Step-by-step explanation: Percent change=difference/original times 100.
2/5 times 100 is 40%
Answer:
4+2w-8z is what I got
Step-by-step explanation:
Answer:
(507.05, 592.95)
Step-by-step explanation:
Given data:
sample mean = $550, sample standard deviation S = $60.05
95% confidence interval , n = 10
For 95% confidence interval for the mean
mean ± M.E.
where M.E. is margin of error = ![t_{n-1}, \alpha/2\times\frac{S}{\sqrt{n} }](https://tex.z-dn.net/?f=t_%7Bn-1%7D%2C%20%5Calpha%2F2%5Ctimes%5Cfrac%7BS%7D%7B%5Csqrt%7Bn%7D%20%7D)
Substituting the values in above equation
![=t_{10-1}, 0.05/2\times\frac{60.05}{\sqrt{10} }](https://tex.z-dn.net/?f=%3Dt_%7B10-1%7D%2C%200.05%2F2%5Ctimes%5Cfrac%7B60.05%7D%7B%5Csqrt%7B10%7D%20%7D)
= 2.62×18.99
=42.955
= 550±42.95
=(507.05, 592.95)