Harry Potter of all the Harry Potter books purchased in a recent year, about 60%

Question

Harry Potter of all the Harry Potter books purchased in a recent year, about 60% were purchased for readers 14 or older. If 12 Harry Potter fans who brought books that year are surveyed. find the following probabilities. At least five of them are 14 or older. Exactly nine of them are 14 or older. Less than three of them are 14 or older. Candy Choices: A candy dish contains nine blue and seven red candies. A child reaches up and selects five candies without looking. What is the probability that there are three blue and two red candies in the selection? The average number of traffic accidents on a certain section of highway is two per week. Assume that the number of accidents follows a Poisson distribution with mu = 2. Find the probability of no accident on this section of highway during a 1-week period. Find the probability of at least one accident on this section of highway during a 1-week period. Find the probability of at most three accidents on this section of highway during a 2-week period. If 2% of the books bound at a certain bindery have defective bindings, use the Poisson approximation to the binomial distribution to determine the probability that 5 of 400 books bound by this bindery will have defective bindings. A certain city has 3 newspapers, A, B, and C. Newspaper A has 50% of the readers in that city. Newspaper B has 30% of the readers, and newspaper C has the remaining 20%. Find the probability that, among 8 randomly-chosen readers in that city, 5 will read newspaper A, 2 will read newspaper B, and 1 will read newspaper C. (assume that no one read more than one newspaper) he following table gives the probabilities that a student has 0, 1, 2, or 3 and more absence per semester.

Explanation / Answer

6. The value of p should be such that sum of all probabilities should be 1

So, .2+.3+.35 +p = 1
p = 1-.2-.3-.35
p = .15

So, value of unknown p is .15

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