英文的统计学问题An official from the securities commission estimates
2个回答
a.
(0.75^6)*(0.25^9)(15C6)+(0.75^7)*(0.25^8)(15C7)+(0.75^8)*(0.25^7)(15C8)+(0.75^9)*(0.25^6)(15C9)+(0.75^10)*(0.25^5)(15C10)=0.3127
b.
1-(0.75^0)*(0.25^15)(15C0)-(0.75^1)*(0.25^14)(15C1)-(0.75^2)*(0.25^13)(15C2)-(0.75^3)*(0.25^12)(15C3)-(0.75^4)*(0.25^11)(15C4)-(0.75^5)*(0.25^10)(15C5)-(0.75^6)*(0.25^9)(15C6)=0.004193
c.
The question does not make any sense.at most 9 and more than 14?
d.
E(x)=np=15*0.75=11.25
You must be taking AP Stats too...well,if you ever need more help,my email is angela3clark@yahoo.com.=) Good luck.
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