Tag: random variable and mathematical expectation

Quizzes (3) Questions (42)

Questions Related to random variable and mathematical expectation

Multiple choice business mathematics and statistics random variable and mathematical expectation discrete and continuous data random variable random variable and its types

State, which of the following variables are continuous and which are discrete :


Sizes of shoes is discrete
If true then enter $1$ and if false then enter $0$

  1. $1$
  2. $0$

  3. Can't determine

  4. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Size of a shoe can have integer values only. Hence, it is a discrete variable.

Multiple choice business mathematics and statistics random variable and mathematical expectation discrete and continuous data random variable random variable and its types

Which one of the statement is discrete variable?

  1. weight of animals in zoo

  2. distance travelled between colleges

  3. number of heads by flipping a coins

  4. height of animals in park
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Discrete variables are countable in a finite amount of time.
So, number of heads when flipping a coin is a discrete variable statement because once the coin is flipped, we will get head or tail result.

Multiple choice business mathematics and statistics random variable and mathematical expectation discrete and continuous data random variable random variable and its types

The statement "number of heads when flipping a coin" is an example of ______ variable.

  1. continuous

  2. dependent

  3. discrete

  4. nominal
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Discrete variables are countable in a finite amount of time.
So, number of heads when flipping a coin is a discrete variable statement because once the coin is flipped, we will get head or tail result.

Multiple choice business mathematics and statistics random variable and mathematical expectation discrete and continuous data random variable random variable and its types

How many times will you brush your teeth. The answer is an example of which type of variable?

  1. continuous

  2. dependent

  3. nominal

  4. discrete
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A discrete variable is a variable whose value is obtained by counting.
So, how many times will you brush your teeth is countable.

Multiple choice business mathematics and statistics random variable and mathematical expectation discrete and continuous data random variable random variable and its types

______ is not a discrete variable.

  1. average mark of a student

  2. what is your age?

  3. shoe size

  4. weight of a dog
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Weight of a dog is not a discrete variable.
Because, the weight of a dog is a continuous variable as it can take any value - for example, $2$ kg, $5$ kg, $4.2$ kg etc.

Multiple choice business mathematics and statistics random variable and mathematical expectation discrete and continuous data random variable random variable and its types

Teacher asked a student to state how many times in the last month they visited their family doctor. The answer is an example of which type of variable?

  1. continuous

  2. dependent

  3. discrete

  4. nominal
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A discrete variable is a variable whose value is obtained by counting.
So, here the student can able to say how many times he visited the doctor.
Therefore, the given statement is discrete.