Assume that each person in a population has chance 2/1000 of carrying a particular disease, independently of all other people. Among 1000 people in this population, the number of people that carry the disease [pick all that are correct].

has a distribution that is approximately normal. has a binomial distribution.
has a hypergeometric distribution.
has a distribution that is right-skewed.
has a distribution that is left-skewed.

Question

Assume that each person in a population has chance 2/1000 of carrying a particular disease, independently of all other people. Among 1000 people in this population, the number of people that carry the disease [pick all that are correct].

has a distribution that is approximately normal. has a binomial distribution. 
has a hypergeometric distribution. 
has a distribution that is right-skewed. 
has a distribution that is left-skewed.

anonymous · Answer

A multiple choice test consists of 100 questions. Each question has 5 possible answers, only one of which is correct. Four points are awarded for each correct answer, and 1 point is taken off for each wrong answer. Suppose you answer all the questions by guessing at random, independently of all other questions.

What is the chance that you get more than 30 points?

anonymous · Answer

Assume that each person in a population has chance 2/1000 of carrying a particular disease, independently of all other people. Among 1000 people in this population, the number of people that carry the disease [pick all that are correct].

Answers:
has a binomial distribution. 
has a distribution that is right-skewed.

anonymous · Answer

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