Språkstatistik HT95:09

Class:   09
Date:    951002
Topic:   Exercises 3

Homework exercises 9

1. You are participating in a football-pool in which you try to guess the result of ten games. There are three results possible: team A wins, team B wins and draw. We assume that are three results are equally probable and you guesses will be determined randomly. There are four prices: one for having ten results correct, one for nine, one for eight and an extra consolation price for having no results correct. The stochastic variable E1 describes the number of results that are correct in one one pool-ticket.
   • E1 is distributed according to some standard distribution. Which one?
   • Give the probability of winning a price for each of the four prices.
   • What is the probability of not winning a price?
   • How many different pool-tickets do you need to fill in in order to have a 90% certainty of winning at least one price. HINT: use a frequency distribution; don't use the table.

2. (should be added)