Which of the following random variables is geometric? The number of 1s when rolling a die 25 times
Ob
The number of digits in a randomly selected row until a 3 is found
Ос
The number of queens dealt from a shuffled deck of 52 cards in a seven-card hand
Od
The number of tails when a coin is tossed 50 times
The number of 4s in a row of 30 random digits

b. The number of digits in a randomly selected row until a 3 is found.

Explanation:

A random variable often used in statistics and probability, is a variable that has its possible values as numerical outcomes of a random experiment or phenomenon. It is usually denoted by a capital letter, such as X.

In statistics and probability, random variables are either continuous or discrete.

1. A continuous random variable is a variable that has its possible values as an infinite value, meaning it cannot be counted.

2. A discrete random variable is a variable that has its possible values as a finite value, meaning it can be counted.

Also, any random variable that meets certain conditions defined in a research study.

Hence, an example of a geometric random variables is the number of digits in a randomly selected row until a 3 is found.