en

English

Español

Português

Français

Deutsch

Italiano

Русский

中文(简体)

한국어

日本語

Tiếng Việt

עברית

العربية

Popular Word Problems >

Use the classical definition to find the probability of the following event: Flipping a fair coin twice and getting 2 heads. Express your answer as a decimal rounded to 1 decimal place.

Solution

U se t h e c l a ss i c a l d e f ini t i o n t o f in d t h e p ro babi l i t y o f t h e f o ll o w in g e v e n t : Fl i pp in g a f ai r co in tw i ce an d g e tt in g 2 h e a d s . 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 .

Solution

\frac{1}{4}

+1

Decimal

0.25

Solution steps

The possible outcomes when a coin is thrown two times are

2 \cdot 2

Therefore, the number of possible outcomes:

2^{2}

Find the number of favorable outcomes of getting 2 heads:

1

Probability

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

= \frac{1}{2 ^{2}}

2^{2} = 4

= \frac{1}{4}

Popular Examples

Joe opened a savings account and deposited 7,559.00 as principal. The account earns 13% interest, compounded annually. What is the balance after 4 years?Find two consecutive whole numbers that lies sqrt(91) between.The area of a circle is 153.9cm^2 . Find the radius, in centimeters, to the nearest centimeter.The area of a rectangular field is 6816m^2 :If the length of the field is 96m , what is its width?tina is ten years older than cosmo. in 4 years, tina will be twice as old as cosmo. how old are they now