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Phổ biến Word Problems >

You flip a coin twice. What is the probability of getting tails and then getting tails?

Lời Giải

Y o u f l i p a co in tw i ce . Wha t i s t h e p ro babi l i t y o f g e tt in g t ai l s an d t h e n g e tt in g t ai l s ?

Lời Giải

\frac{1}{4}

+1

Số thập phân

0.25

Các bước giải pháp

Find the probability of getting tails:

\frac{1}{2}

Find the probability of then getting tails:

\frac{1}{2}

Since the events are independent, Use the formula

P (X_{1} \land X_{2} \land \dots \land X_{k}) = P (X_{1}) \cdot P (X_{2}) \cdot \dots \cdot P (X_{k})

= \frac{1}{2} \cdot \frac{1}{2}

\frac{1}{2} \cdot \frac{1}{2} = \frac{1}{4}

= \frac{1}{4}

Ví dụ phổ biến

12 Complete this number sentence.the product of a number and 15 is not less than 15 17 more than some number is equal to 85.Find the original price of a salt lamp that is 63 after a 30% discount.a 2 divided by the sum of 2 and a number