Question

Fan & medal! Find the mean, standard deviation, and variance.

Answer 1

Please show steps so I can learn how to do it.

Answer 2

the mean expenditure is the sum of the expenditure divided by the number of days

Answer 3

the mean (expenditure squared) is the sum of the squared expenditures divided by the number of days

the standard deviation is the square root of: the difference between the mean (expenditure squared) and the square of the mean expenditure

Answer 4

the variance is just:
the difference between the mean (expenditure squared) and the square of the mean expenditure

Answer 5

To find the mean, add together the 7 data points. Divide that sum by 7.
Represent the mean with x-bar: