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A $95\%$ confidence interval for a car's average speed (mph) on West Street is $(30,40)$.

From this interval, what is the margin of error for the car's average speed (in mph)?

A

$5\text{ mph}$

B

$10\text{ mph}$

C

$35\text{ mph}$

D

$70\text{ mph}$

E

It cannot be determined from the information given.

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