The rate of return in the investment is -15.7%
Answer:
i think it would be A
Step-by-step explanation:
Answer:
2.28%
Step-by-step explanation:
The z score is used to determine how many standard deviations that the raw score is above or below the mean. If the z score is positive then the raw score is above the mean and if it is negative then it is below the mean. It is given by:
![z=\frac{x-\mu}{\sigma}\\ \\\mu = mean, \sigma=standard\ deviation,x=raw\ score\\\\For\ a\ sample\ n\\\\z=\frac{x-\mu}{\sigma/\sqrt{n} }\\\\For\ x](https://tex.z-dn.net/?f=z%3D%5Cfrac%7Bx-%5Cmu%7D%7B%5Csigma%7D%5C%5C%20%5C%5C%5Cmu%20%3D%20mean%2C%20%5Csigma%3Dstandard%5C%20deviation%2Cx%3Draw%5C%20score%5C%5C%5C%5CFor%5C%20a%5C%20sample%5C%20n%5C%5C%5C%5Cz%3D%5Cfrac%7Bx-%5Cmu%7D%7B%5Csigma%2F%5Csqrt%7Bn%7D%20%7D%5C%5C%5C%5CFor%5C%20x%3C70.5%5C%20in%5C%5C%5C%5CGiven%20%5C%20that%5C%20n%3D100%2C%20%5Cmu%3D71%5C%20in%2C%20%5Csigma%3D2.5%5C%20in%5C%5C%5C%5Cz%3D%5Cfrac%7B70.5-71%7D%7B2.5%2F%5Csqrt%7B100%7D%20%7D%3D-2%5C%5C%5C%5CFrom%5C%20normal%5C%20distribution%5C%20table%2C%20P%28x%3C70.5%29%3DP%28z%3C-2%29%3D0.0228%3D2.28%5C%25)