Question

英文的统计学问题An official from the securities commission estimates

Answer 1

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 [e-mail].=) Good luck.