1.- If the number of values that a variable can take are countable (either finite or infinite), and if these values can be arranged in a sequence that corresponds to positive integers, we are talking about a variable:

a) continuous random variable

b)discrete random variable

c)continuous discrete random variable

d)statistical variable

2.- Indicate what type of distribution the following properties describe:

- The distribution is symmetric about the mean. Therefore, the mean is equal to the median.

- The data that are part of this distribution tend to cluster around the mean.

- Only a small percentage of the data is more than three standard deviations from the mean.

a)Uniform distribution

b) Binomial distribution

c) Poisson distribution

d)Normal distribution

3.- It is a measure of the dispersion in the probability distribution:

a)variance of a random variable

b)standard deviation of a random variable

c)probability of the random variable

d)expected value of a random variable

4.- The results of certain blood tests are known to be normally distributed. Indicates what percentage of the results is between 40 and 80.

= 60 and = 18

a)10%

b)3%

c)1%

d)73%

5.- A measure that compares the relative dispersion of two probability distributions is the coefficient of variation, which is defined by:

O = O O = O