Please help don’t understand at alll

Answer:
47.3
Step-by-step explanation:
To find the standard deviation use this example formula
[tex]a =\sqrt{\frac{(x-u)^{2} }{N} }[/tex]
a = your answer, the standard deviation you are looking for
x = the value of each carrier
u = the carrier numbers mean (such as mean, median, and mode)
N = the overall total of the carriers
If you find this equation still confusing one of my favorite sites to use is Math.way, where you plug in each number with a comma in between and it solves it for you. Other sites work such as Calculatornet, Calculator.Soup, and Math.is.Fun.
Hope this helps :)