Answer:
B
Explanation:
hope i helped if im wrong sorry;-;
Answer:
Lamp lighter
Explanation:
Very few exist today as most street lighting has long been replaced by electric lamps.
It is called the law of demand and supply whereby when the supply of commodity increases, the need reduces. The market becomes flooded with the items while the number of customers is constant. Moreover, when the supply of a good diminishes its demand goes up.
Answer:
n = 100 customers
X = 80 who paid at the pump
A) the sample proportion = p = X / n = 80 / 100 = 0.8
we can definitely state that 80% of the customers paid at the pump.
B) if we want to determine the 95% confidence interval:
z (95%) = 1.96
confidence interval = p +/- z x √{[p(1 - p)] / n}
0.80 +/- 1.96 x √{[0.8(1 - 0.8)] / 100}
0.80 +/- 1.96 x √{(0.8 x 0.2) / 100}
0.80 +/- 1.96 x √{(0.8 x 0.2) / 100}
0.80 +/- 1.96 x 0.4
0.80 +/- 0.0784
confidence interval = (0.7216 ; 0.8784)
C) We can estimate with a 95% confidence that between 72.16% and 87.84% of the customers pay at the pump.
