The answer is C.
The question asks for the total amount of tires on all of the toy tractors.
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➷ Standard deviation = 
Substitute the values in:
= 8.1975...
This can be rounded to give an approximate answer of 8.2
The answer is option A.
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Temperature will be plotted on the y-axis
2x + 5(-3x-10) = - 154
2x -15x -50 = -154
-13x = -104
13x = 104
x = 104/13
X = 8
The diameter would be twice 5, or 10