A random sample of the price of gasoline from 40 gas stations in a region gives the statistics below. Complete parts​ a) through​ c). y overbarequals​$3.59​, sequals​$0.26 ​a) Find a 95​% confidence interval for the mean price of regular gasoline in that region. (nothing comma nothing )​(Round to three decimal places as​ needed.) ​b) Find the​ 90% confidence interval for the mean. (nothing comma nothing )​(Round to three decimal places as​ needed.) ​c) If we had the same statistics from a sample of 80 ​stations, what would the​ 95% confidence interval be​ now? (nothing comma nothing )​(Round to three decimal places as​ needed.)

the answer is: d) o, f, and kr.

atomic radius of bromine (br) is 114 pm.

atomic radius of oxygen (o) is 73 pm.

atomic radius of fluorine (f) is 72 pm.

atomic radius of krypron (kr) is 112 pm.

the atomic radius of a chemical element is a measure of the size of its atom.

the atomic radius varies with increasing atomic number, but usually increases because of increasing of number of electrons.

the atomic radius decreases across the periods because an increasing number of protons, because greater attraction between the protons and electrons.

the 8 in 8,420 is in the thousands place so it's value is 8 thousand.

the 8 in 6,870 is in the hundreds place so it's value is 8 hundred.

divide 8000 by 800 to find the answer:

8000 / 800 = 10

the 8 in 8,420 is 10 times greater than the 8 in 6,870

i believe it's a.

i'm not sure on this one, most likely correct.