Analysts estimate that there are about$\_\_\_\_\_\_\_\_$ billion connected devices through the Internet of Things$($IoT$).$

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Part $1$

A$.$

$27\mathrm{.}0$

B$.$

$14\mathrm{.}0$

C$.$

$40\mathrm{.}0$

D$.$

$63\mathrm{.}0$

E$.$

$55\mathrm{.}0$