Question
The annual sales, in millions, for 28 toy department stores is listed.
A)Calculate the mean and standard deviation of the data. Answer to the nearest tenth.
B) Calculate the percent of sales to the nearest whole number, that are:
i)within one SD of the mean
ii)within two SD of the mean
A)Calculate the mean and standard deviation of the data. Answer to the nearest tenth.
B) Calculate the percent of sales to the nearest whole number, that are:
i)within one SD of the mean
ii)within two SD of the mean
Answers
Al
"The annual sales, in millions, for 28 toy department stores is listed."
I don't see a list...
I don't see a list...
Damon
The folowing calculator link might help:
http://qudata.com/online/statcalc/
http://qudata.com/online/statcalc/
Damon
hit "clear", then enter your data on the left, then "calc"
Damon
If your data is not in ascending order of sales, hit "sort" so the second part of your question will be easier.
Damon
I get mean = 32.3
sigma = 6.45 so 2 sigma = 2*6.45 = 12'9
and here is your list ordered
mean - 12.9 = 19.4 , below your whole list
21.0
23.0
24.0
24.0
24.0
note here is mean - 6.45
27.0
27.0
27.0
27.0
29.0
31.0
32.0
note mean = 32.3
33.0
33.0
33.0
33.0
33.0
34.0
35.0
35.0
35.0
36.0
38.0
38.0
note - here is mean + 6.45
40.0
43.0
44.0
45.0
note - here is mean + 12.9 - below your list
your whole list is within 2 sigma of mean 100%
19/28 is within 1 sigma of mean
100 * 19/28 = 68% within 1 sigma
sigma = 6.45 so 2 sigma = 2*6.45 = 12'9
and here is your list ordered
mean - 12.9 = 19.4 , below your whole list
21.0
23.0
24.0
24.0
24.0
note here is mean - 6.45
27.0
27.0
27.0
27.0
29.0
31.0
32.0
note mean = 32.3
33.0
33.0
33.0
33.0
33.0
34.0
35.0
35.0
35.0
36.0
38.0
38.0
note - here is mean + 6.45
40.0
43.0
44.0
45.0
note - here is mean + 12.9 - below your list
your whole list is within 2 sigma of mean 100%
19/28 is within 1 sigma of mean
100 * 19/28 = 68% within 1 sigma
Wow
Fhagbst i don't get it
SHATRA
My hands hurt.