Four research teams each used a different method to collect data on how
fast a new brand of paint dries. assume that they all agree on the sample size
and the sample mean (in minutes). use the confidence level; confidence
interval) pairs below to select the team that has the smallest sample
standard deviation.
a. confidence level: 95%; confidence interval: 40 to 50
o
b. confidence level: 68%; confidence interval: 44.5 to 45.5
c. confidence level: 95%; confidence interval: 35 to 55
o
d. confidence level: 99.7%; confidence interval: 42 to 48

step-by-step explanation:

12: 00 p.m. to 7: 00 p.m. is a total of 7 hours.

4: 00 p.m. to 7: 00 p.m. is a total of 3 hours.

this means that from 4: 00 p.m to 7: 00 p.m. this represents 3/7 of what was lost from 12: 00 p.m. to 7: 00 p.m.

after knowing this, after doing 11,600 - 6,800 = 4,800

4,800 represents 3/7 of what was lost for 7 hours.

we then divide 4,800 by 3 which gets 1,600.

because we know that 1,600 represents 1/7 of how much water was lost, we just have to multiply by 7, which gets 11,200.   after adding 11,200 to how much water was left at 7: 00 p.m. which was 6,800. 11,200 + 6,800 = 18,000

this means that the pool originally had 18,000 gallons in the pool.

you can also check your work by doing 18,000 - 4(1600), which becomes           1800 - 6400 which gets you 11,600.

i got 10.28 but that rounds up to 10.3

a)(x-2)^2+(y-1)^2=9

step-by-step explanation:

(picture explains)

but there’s no any figure there!