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

Question

leozap1 · Answer

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

unklerhaukus · Answer

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

unklerhaukus · Answer

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

unklerhaukus · Answer

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

mathmale · Answer

To find the mean, add together the 7 data points.  Divide that sum by 7.  
Represent the mean with x-bar:|dw:1453038940871:dw|