Answer:
180
Step-by-step explanation:
75% times 240 would be 180
Sample size=n=250
sample proportion=p=0.4
95% confidence interval so significance level α=1-0.95=0.05
So, α/2=0.025
z_( α/2)=1.960 (value taken from statistic z-table)
use formula;
p(+/-)z_(α/2)square root(p(1-p)/n)
(0.4-1.960 sq.root(0.4(1-0.4)/250), 0.4+1.960 sq.root(0.4(1-0.4)/250))
(-0.2073,0.4607) (estimation of population proportion)
9.862 rounded the the nearest tenth in 9.9
I'm pretty sure the answer is b. because obviously 1.2 in is the least and the second least is the square root of 3.
The answer is -a^2+2ab+b^2
