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受欢迎的 Word Problems >

Use the binomial distribution to find the probability that five rolls of a fair die will show exactly two threes. Express your answer as a decimal rounded to 1 decimal place.

解答

U se t h e bin o mia l d i s t r ib u t i o n t o f in d t h e p ro babi l i t y t ha t f i v e ro ll s o f a f ai r d i e w i ll s h o w e x a c tl y tw o t h rees . E x p ress yo u r an s w er a s a d ec ima l ro u n d e d t o 1 d ec ima l pl a ce .

解答

\frac{625}{3888}

+1

十进制

0.16075 \dots

求解步骤

Probability of 3 when a die is rolled:

\frac{1}{6}

For multiple independent trials

P (x) = n C x \cdot p^{x} \cdot (1 - p)^{n - x}

number of trials

n = 5

number of successes

x = 2

probability of success in any one trial

p = \frac{1}{6}

P (2) = 5 C 2 (\frac{1}{6})^{2} (1 - \frac{1}{6})^{5 - 2}

5 C 2 = 10

= 10 (\frac{1}{6})^{2} (\frac{5}{6})^{3}

10 (\frac{1}{6})^{2} (\frac{5}{6})^{3} = \frac{625}{3888}

= \frac{625}{3888}

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