A coffee shops tracks sales and has observed the distribution in the following table. What is the standard deviation of​ sales?    # of sales           130       135       140         145       150 Probability         0.15      0.21      0.39        0.18      0.07     The standard deviation of daily sales is _____ (Round to two decimal places as needed)

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A coffee shops tracks sales and has observed the distribution in the following table. What is the standard deviation of​ sales? 
 
# of sales           130       135       140         145       150
Probability         0.15      0.21      0.39        0.18      0.07
 
 
The standard deviation of daily sales is _____
(Round to two decimal places as needed) 
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