Talia tossed a penny many times. She got 20 heads and 55 tails. She said the experimental probability of getting heads was
20
55
. Explain and correct her error by completing the sentence. Enter your answer as a simplified fraction.

And the error was because she use 55 as the total number of trials and that's not the size of the sample space and for this reason she got [tex]\frac{20}{55}[/tex]

Step-by-step explanation:

For this case we know that in many times a penny shoes 20 head and 55 tails so then the total of trials are:

[tex] n = 20 +55=75[/tex]

Then we are interested in the probability of getting heads and if we use the Laplace formula we have:

[tex] p =\frac{Possible}{total}[/tex]

And the correct way would be:

[tex] p =\frac{20}{20+55}=\frac{20}{75}[/tex]

If we simplify we got:

[tex] p =\frac{4}{15}[/tex]

And the error was because she use 55 as the total number of trials and that's not the size of the sample space and for this reason she got [tex]\frac{20}{55}[/tex]

Talia tossed a penny many times. She got 20 heads and 55 tails. She said the experimental probability of getting heads was 20 55 . Explain and correct her error by completing the sentence. Enter your answer as a simplified fraction.

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Talia tossed a penny many times. She got 20 heads and 55 tails. She said the experimental probability of getting heads was
20
55
. Explain and correct her error by completing the sentence. Enter your answer as a simplified fraction.