In a box there are two green balls and two red balls. Consider that two balls are randomly selected without replacement. The probability of these two balls having the same color is:

Consider the histogram depicted below:

Which boxplot depicts the same data as the histogram?

Consider the following statements referring to the use of the addition rule and to the use of the multiplication rule in probability theory:

• We multiply when we see [K] for independent events;
• We add when we see [Y] for mutually exclusive events;
• We can still multiply for dependent events when we see [W] but we do so using [Z] probability;

What stands for K, Y , W and Z, respectively?

In a specific region, the probability of a thunderstorm occurring during the summer season is 0.3. The probability of heavy rainfall during the summer season is 0.4. The probability of both a thunderstorm and heavy rainfall occurring during the summer season is 0.2. What is the probability that there will be either a thunderstorm or heavy rainfall (or both) during the summer season?

Two events are said to be independent if the occurrence of one event:

Consider the frequency table below displaying the number of parking tickets that a random sample of 140 individuals got in the last month. 

Knowing that the sample mean is 0.521, what is the mean absolute deviation? Present you result with two decimal values.