Answer:
b
Step-by-step explanation:
Margin of error = +/- Z*SD/sqrt (n)
Where, Z = 1.96 at 95% confidence interval, SD =standard deviation = 589 dollars, n= sample size (to be calculated)
For the values given;
132= 1.96*589/Sqrt (n) => Sqrt (n) = 1.96*589/132 = 8.7458 => n= 8.7458^2 = 76.49
Rounding up to near a person, n (sample size)= 77 students
Answer:
60x + 45y = 2400
Step-by-step explanation:
60 is the amount for normal tickets (x) and 45 is the amount for reserved tickets (y). 2400 is the total amount! Hope this helps! Can I please have brainliest!?!
Answer:
9.2
Step-by-step explanation:
14+16+11+2+6+6+15+2+11 = 83
83/9 = 9.2
Answer:
-7 .5+ 2.5 i
Step-by-step explanation:
(-11+i) (-4+ 4i)
find the midpoint
use the same formula for midpoint we use for x and y
midpoint = (a1+a2)/2 +(b1+b2)/2 i
midpoint =( -11+-4)/2 + (1+4)/2 *i
= -15/2 + 5/2 i
-7 .5+ 2.5 i