Answer the question.
-If you are told that a randomly selected mystery person was born in the 1990's, what is the probability of guessing his/her exact birth date (including year)?
A) $2.737 \times 10 ^ { - 3 }$
B) $2.740 \times 10 ^ { - 4 }$
C) $2.738 \times 10 ^ { - 3 }$
D) $2.738 \times 10 ^ { - 4 }$

Question

Answer the question.
-If you are told that a randomly selected mystery person was born in the 1990's, what is the probability of guessing his/her exact birth date (including year)? 
A) $2.737 \times 10 ^ { - 3 }$
B) $2.740 \times 10 ^ { - 4 }$
C) $2.738 \times 10 ^ { - 3 }$
D) $2.738 \times 10 ^ { - 4 }$

Quizplus · Accepted Answer

Assuming that there are 365 days in a year, the probability of guessing the exact birth date of a randomly selected person is 1/365. Since the birth year is given to be in the 1990's, there are 365 days in each year from 1990 to 1999, inclusive. Therefore, the total number of possible birth dates is 10 * 365 = 3650. The probability of guessing the exact birth date is then 1/3650 = 2.738 x 10^-4. The closest value to this answer is D, so D is the best choice.

Answer the Question 2.737×10−32.737 \times 10 ^ { - 3 }2.737×10−3

Answer the Question $2.737 \times 10 ^ { - 3 }$