Answer:
95 percent confidence interval
[0.208,0.29166]
Step-by-step explanation:
First we identificate the sample proportion p = 27 /108, and we find the 95 percent confidence interval for P(population proportion) in this context the parking violations that have prior unpaid parking tickets.
Then α = 0.05 and 1 - α/2 = 0.975
Thus
The 95 percent confidence interval is
[ p ± 1.96 ]
[0.25 ± 1.96 ]
[0.208,0.29166]
Answer:
Step-by-step explanation:
If J can paint a room in 3 hours, in 1 hour she gets of the job done.
If A can paint a room in 4 hours, in 1 hour she gets of the job done. We need to find out how long it takes them if they paint together. The equation for this is:
where x is the number of hours it takes them to get the job done together. Multiply everything through by 12x to get
4x + 3x = 12 so
7x = 12 and
x = 1.7 hours to get the room painted together.