Week 3 Assignment

Question 1

Seventy percent of the students applying to a university are accepted. Using the binomial probability tables or Excel, what is the probability that among the next 18 applicants:

  1. At least 6 will be accepted?
  2. Exactly 10 will be accepted?
  3. Exactly 5 will be rejected?
  4. Fifteen or more will be accepted?
  5. Determine the expected number of acceptances.
  6. Compute the standard deviation.

Question 2

Scores on a recent national statistics exam were normally distributed with a mean of 80 and a standard deviation of 6.

  1. What is the probability that a randomly selected exam will have a score of at least 71?
  2. What percentage of exams will have scores between 89 and 92?
  3. If the top 2.5% of test scores receive merit awards, what is the lowest score eligible for an award?

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