Question 1147638
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It was solved uncountable number of times in this forum


https://www.algebra.com/algebra/homework/Probability-and-statistics/Probability-and-statistics.faq.question.1121943.html


https://www.algebra.com/algebra/homework/Probability-and-statistics/Probability-and-statistics.faq.question.974232.html


https://www.algebra.com/algebra/homework/Probability-and-statistics/Probability-and-statistics.faq.question.1135425.html


https://www.algebra.com/algebra/homework/Probability-and-statistics/Probability-and-statistics.faq.question.1044521.html


https://www.algebra.com/algebra/homework/Probability-and-statistics/Probability-and-statistics.faq.question.1112979.html


and 5000 more times . . .