Question

Use a calculator to find the mean and standard deviation of the data. Round to the nearest tenth.

946, 726, 956, 519, 104, 415, 428, 457, 614, 201, 772, 801
A. mean = 578.3; standard deviation = 68572.4

B. mean = 566.5; standard deviation = 261.9

C. mean = 566.5; standard deviation = 68572.4

D. mean = 578.3; standard deviation = 261.9

Answer 1

it says to use a calculator, hopefully one with this function on it, that is, where you plug in the data and compute the standard deviation with a button

Answer 2

here is an on line one, we can knock this out in an instant
otherwise it is a real pain

Answer 3

not the mean, that is easy
but the standard deviation is hard

Answer 4

in fact once we find the mean is \(578.25\) we can eliminate the other two

Answer 5

once we have it to A or D it must be D because the standard deviation is a measure of how close the data is to the mean, so the first answer makes no sense
here is the answer
http://www.wolframalpha.com/input/?i=standard+deviation+++946%2C+726%2C+956%2C+519%2C+104%2C+415%2C+428%2C+457%2C+614%2C+201%2C+772%2C+801

Answer 6

Ahhhh. I got it. Thanks.

Answer 7

yw