Språkstatistik HT95:07

Class:   07
Date:    950926
Topic:   Binomial and normal distribution

Homework exercises 7

1. We throw a coin 20 times. The stochastic variable E1 that describes the number of heads that appear has a binomial distribution.
   • Give the binomial distribution formula which can be used for computing the probability that 12 heads appear. Assign values to as many variables as possible.
   • Give the normal distribution formula which can be used for approximating the probability that exactly 12 heads appear. Assign values to as many variables as possible.

2. We throw a die 6 times. The stochastic variable E2 that describes the number of sixes that appear has a binomial distribution.
   • Give the binomial distribution formula which can be used for computing the probability that exactly one six appears. Assign values to as many variables as possible.
   • Give the normal distribution formula which can be used for approximating the probability that exactly one six appears. Assign values to as many variables as possible.