Question 10 of 16, Step 1 of 1 standard die is rolled. Find the probability that the number rolled is less than 5. Express your answer as a fraction in lowest terms or a decimal rounded to the nearest millionth.

解

Q u es t i o n 10 o f 16, St e p 1 o f 1 s t an d a r d d i e i s ro ll e d . F in d t h e p ro babi l i t y t ha t t h e n u mb er ro ll e d i s l ess t han 5. E x p ress yo u r an s w er a s a f r a c t i o n in l o w es t t er m s or a d ec ima l ro u n d e d t o t h e n e a res t mi ll i o n t h .

\frac{2}{3}

十進法表記

0.66666 \dots

解答ステップ

The possible outcomes when \mathrm{a die is rolled} is

{1, 2, 3, 4, 5, 6} .

Therefore, the number of possible outcomes:

6

The number of favorable outcomes of \mathrm{the number rolled is less than 5}:

4

Probability

= \frac{number of favorable outcomes}{total number of outcomes}

= \frac{4}{6}

共通因数を約分する:

2

= \frac{2}{3}