Question

What is the standard deviation of the following data? If necessary, round your answer to two decimal places. 82, 44, 67, 52, 120?

Answer 1

can you first find the average of those numbers ?

Answer 2

The average is 73

Answer 3

@phi ^

Answer 4

it might help you: https://www.mathsisfun.com/data/standard-deviation-formulas.html

Answer 5

P.S. - the steps are already there.. you will just read that and apply to your given data. :)

Answer 6

the next step is to do
number - 73
for each number on your list
(you will get both positive and negative numbers, that is ok)

next, square each of those differences
(you get all positive numbers)

find the average of the numbers
finally , find the square root of that average
that will be the standard deviation.

Answer 7

The numbers were 81,841,36,441,2209 & the a average= 4699
The average squared= 22080601 is that correct ? @phi

Answer 8

what did you get for
82-73
44-73
67-73
52-73
120-73
?

Answer 9

ok your numbers look good
except for the last step.
you don't square the average, you take the square root.

Answer 10

phi are you a mod?

Answer 11

The numbers were 81,841,36,441,2209
that part is ok.
but I got a different average

Answer 12

68.54 @phi is that correct now ?

Answer 13

getting closer. what did you get for the average of
81,841,36,441,2209

Answer 14

721.6 for the average @phi

Answer 15

yes, that looks good. now take the square root to get the
"standard deviation"

Answer 16

26.86 @phi ?

Answer 17

yes

Answer 18

Thank you so much @phi