Final answer:
The statements 1 and 3 are true for only continuous distributions, while statement 2 is true for only discrete distributions. Statement 4 is true for some discrete distributions but not all.
Step-by-step explanation:
The statements 1 and 3 are true for only continuous distributions, while statement 2 is true for only discrete distributions. Statement 4 is true for some discrete distributions but not all.
1. For only continuous distributions: This statement is true because continuous distributions, such as the normal distribution, have a continuous range of possible values.
2. For only discrete distributions: This statement is true because discrete distributions, such as the binomial distribution or the Poisson distribution, have a countable number of possible values.
3. For all distributions: This statement is false because not all distributions, such as the mixed distribution, can be classified as either continuous or discrete.
4. For some discrete distributions but not all: This statement is true because there exist discrete distributions, such as the geometric distribution, that do not satisfy the conditions of statement 2.