10 percent of 145..........
2 answers:
The answer is 10/100 *145=1.45
To get this, take 0.10 x 145 = 14.5
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You should study what your teacher thought you
answer:
8417yd
Step-by-step explanation:
For each 
, ![E[X_i]=0](https://tex.z-dn.net/?f=E%5BX_i%5D%3D0)
, so that
![\displaystyle E[Y_1]=E\left[\frac1n\sum_{i=1}^nX_i\right]=\frac1n\sum_{i=1}^nE[X_i]=0](https://tex.z-dn.net/?f=%5Cdisplaystyle%20E%5BY_1%5D%3DE%5Cleft%5B%5Cfrac1n%5Csum_%7Bi%3D1%7D%5EnX_i%5Cright%5D%3D%5Cfrac1n%5Csum_%7Bi%3D1%7D%5EnE%5BX_i%5D%3D0)
Meanwhile,
![\displaystyle E[Y_2]=\frac1n\sum_{i=1}^nE[|X_i|]](https://tex.z-dn.net/?f=%5Cdisplaystyle%20E%5BY_2%5D%3D%5Cfrac1n%5Csum_%7Bi%3D1%7D%5EnE%5B%7CX_i%7C%5D)
Each of the 
have PDF
for 
. From this we get
![E[|X_i|]=\displaystyle\frac1{\sqrt{2\pi}}\int_{-\infty}^\infty|x|e^{-x^2/2}\,\mathrm dx=\sqrt{\frac2\pi}\int_0^\infty xe^{-x^2/2}\,\mathrm dx=\sqrt{\frac2\pi}](https://tex.z-dn.net/?f=E%5B%7CX_i%7C%5D%3D%5Cdisplaystyle%5Cfrac1%7B%5Csqrt%7B2%5Cpi%7D%7D%5Cint_%7B-%5Cinfty%7D%5E%5Cinfty%7Cx%7Ce%5E%7B-x%5E2%2F2%7D%5C%2C%5Cmathrm%20dx%3D%5Csqrt%7B%5Cfrac2%5Cpi%7D%5Cint_0%5E%5Cinfty%20xe%5E%7B-x%5E2%2F2%7D%5C%2C%5Cmathrm%20dx%3D%5Csqrt%7B%5Cfrac2%5Cpi%7D)
![\implies E[Y_2]=n\sqrt{\dfrac2\pi}](https://tex.z-dn.net/?f=%5Cimplies%20E%5BY_2%5D%3Dn%5Csqrt%7B%5Cdfrac2%5Cpi%7D)
Step-by-step explanation:
