Question

You measure the mass of a 500 g standard on your balance four times. You get values of 455 g, 456 g, 454 g, and 455 g. Which of the following best describes your balance?

Answer 1

We can not see your list. I would say wrong :)

Answer 2

sorry.
not precise and not very accurate

not precise but very accurate

precise and accurate

precise but not very accurate (i think its this one)

Answer 3

precise but not very accurate (i think its this one)

yes, values close together but wrong

Answer 4

Precision refers to the closeness of two or more measurements to each other...
Accuracy refers to the closeness of a measured value to a standard or known value....
So would it be precise and accurate?

Answer 5

it is precise
it is NOT accurate
455 is NOT 500

Answer 6

ok.. thanks c:

Answer 7

Calculate the wavelength (in m) of a photon capable of exciting an electron in Li2+ from the state n= 3 to the state n=5

1.4239*10^-7 - correct