The document discusses properties of uniform probability distributions and relationships between primary and foreign keys in databases. To find the value of P(X < a) = 0.2 for a uniform distribution XU(3,3), you would use qunif(0.2, min=3, max=3) which gives the quantile function. The correct statement is that a foreign key can be used to cross-reference relations between tables in a database.

1. please explain in r
Consider the uniform probability distribution given by XU(3,3), how would we get the value for P(X
<a)=0.2 ? Select one: a. punif(0.2,min=3,max=3) b. runif(0.2,min=3,max=3) c. dunif(0.2,min=3,
max=3) d. qunif(0.2,min=3,max=3)Which of the following statement is correct? Select one: a.
Entity integrity rule requires a primary key matches the values of a foreign key. b. A foreign key
can be used to cross-reference relations. c. A primary key is allowed to have redundant attributes.
d. Entity integrity rule applies to foreign keys as well since a foreign key matches the values of a
primary key.