jnthnsngh
18.12.2021 •
Mathematics
College Costs The mean undergraduate cost for tuition, fees, room, and board for four-year institutions was $26,489 for the 2004–2005 academic year. Suppose that s $3204 and that 36 four-year institutions are randomly selected. Find the probability that the sample mean cost for these 36 schools is
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Ответ:
it means. F(K) =25,64 for some value of k
for 25
25=k²+2k+1
k²+2k-24=0
k²+6k-4k-24=0
K(k+6)-4(k+6)=0
(k-4)(k+6)=0
k=-6,+4
for 64
k²+2k-63=0
k²+9k-7k-63=0
k(k+9)-7(k+9)=0
(k-7)(k+9)=0
k=-9,+7
so the domain of F(k)={ -9 , -6 , 4 , 7 }