Question

The Probability Of Guessing Correctly At Least 8 Out Of 10 Answer On A True-False Examination Is

Answer 1

$\Large{\underline{\underline{\bf{Solution :}}}}$

★ To Find :

We have to find the probablity of getting at least 8 Answers correct out of 10 answers one a true-False Examination

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★ Solution :

Total Outcomes = 10 (Because there are 10 True-False questions)

Favourable Outcomes = 8 (Because we have to find probability of getting 8 answers correct)

So, We know that

$\large{\implies{\boxed{\boxed{\sf{Probablity = \frac{Favourable \: Outcomes}{Total \: Outcomes}}}}}}$

Put Values in above formula we will get probablity.

$\sf{→ Probability = \frac{\cancel{8}}{\cancel{10}}} \\ \\ \sf{→ Probability = \frac{4}{5}} \\ \\ \Large{\implies{\boxed{\boxed{\sf{Probability = \frac{4}{5}}}}}}$