The Fraction of Television Sets Manufactured by a Certain Company $f ( t ) = e ^ { - 0.3 t }$

Multiple Choice

The fraction of television sets manufactured by a certain company that are still in working condition after t years of use is approximately $f ( t ) = e ^ { - 0.3 t }$ What fraction can be expected to fail before 5 years of use? Round your answer to two decimal places, if necessary.

A) 4.48
B) 0.78
C) 1.00
D) 0.22