QUIZ 1

It is a variable whose value is determined by the outcome of a random procedure.

• Random Variable

• Discrete

• Continuous

Assume the “student” in the situation is chosen at random, and state whether the variable is discrete or continuous.

• The number of books the student has in his or her bag.

• Discrete random variable

• Continuous random variable

• Neither discrete nor continuous

A point is randomly selected from the interior of a square. Let x denote the distance from the lower left-hand corner A of the square to the selected point. Are the possible values of x a discrete or continuous variable?

• discrete random variable

• continuous random variable

• neither discrete random variable nor continuous random variable

Experiment: Ask 50 shampoo users. Let X be the number of satisfied users.  What are the possible values of X?

Which of the following is a continuous random variable?

• The number of students online.

• The time you spent in praying.

• The number of COVID-19 cases.

• The number of front liners in your city/municipality.

State whether it is Discrete or Continuous;

The speed of a car

• Discrete

• Continuous

Which of the following random variables is NOT continuous?

• Amount of gasoline in a car.
• Time it takes to commute to work.
• Number of goals scored by a hockey team.
• Lifetime of a AAA battery.

A random variable is defined by a rule that assigns a _______________ to every outcome in a sample space.

• number

• letter

• Event

• probability

Is this a probability distribution?

• No, the sum of p(x) does not equal 1.

• Yes, all p(x) are between 0 and 1.

• No, all p(x) are not between 0 and 1.

• Yes, the sum p(x) is 1.

Is this a probability distribution?

• No, the sum of p(x) does not equal 1.

• Yes, all p(x) are between 0 and 1.

• No, all p(x) are not between 0 and 1.

• Yes, the sum p(x) is 1.