Answer:
They should interview 1620 adults now.
Step-by-step explanation:
Margin of error of a confidence interval:
The margin of error of a confidence interval has the following format:
In which z is related to the confidence level, 
is the standard deviation of the population and n is the size of the sample.
In this question:
z wont change, neither will
We want to increase n as such the margin of error is reduced to one third.
We have that the margin of error is inversely proportional to the square root of the size of the sample, which means that for the margin of error to be reduced to one third, the sample size has to be multiplied by 
. So
180*9 = 1620
They should interview 1620 adults now.
Answer:
1 3/5
Step-by-step explanation:
The drip rate can be written as a proportion, where d is the daily drip volume.
(2/3 gal)/(10 h) = d/(24 h)
Multiplying by 24, we have ...
d = (2/3 gal)·(24/10) = 48/30 gal = 1 3/5 gal
1 3/5 gallons of water drip per day.
Answer:
16 Days
Step-by-step explanation:
1 U.S. Liquid gallon is equal to 16 U.S. Cups, so 1 Cup per day out of a Gallon = 16 Days
Answer:
1.11,1.23,2.13, 3.12
Step-by-step explanation:
a)
3 chocolate chip cookies - $2.49 .
So 1 chocolate chip cookies costs 2.49/3=$0.83
b)
1 chocolate chip cookie costs $0.83
20 chocolate chip cookies cost 0.83*20=$16.6
Full credits to a Brainley User.
