The owner of a local movie theater keeps track of the number of tickets sold in each purchase and makes a probability distribution based on these records. Let X represent the number of tickets bought in one purchase. The distribution for X is given in the table.

A 2-column table with 5 rows. Column 1 is labeled number of tickets with entries 1, 2, 3, 4, 5. Column 2 is labeled Probability with entries 0.29, 0.44, 0.19, 0.06, 0.02.

What is the standard deviation of the distribution?

0.89
0.95
1.41
1.99

Respuesta :

According to the discrete distribution given, the standard deviation is of 0.95.

The distribution is:

[tex]P(X = 1) = 0.29[/tex]

[tex]P(X = 2) = 0.44[/tex]

[tex]P(X = 3) = 0.19[/tex]

[tex]P(X = 4) = 0.06[/tex]

[tex]P(X = 5) = 0.02[/tex]

The expected value is given by the sum of each value multiplied by it's respective probability, hence:

[tex]E(X) = 0.29(1) + 0.44(2) + 0.19(3) + 0.06(4) + 0.02(5) = 2.08[/tex]

The standard deviation is the square root of the sum of the difference squared of each value and the mean, multiplied by it's respective probability, hence:

[tex]\sqrt{V(X)} = \sqrt{0.29(1-2.08)^2 + 0.44(2-2.08)^2 + \cdots + 0.02(5-2.08)^2} = 0.95[/tex]

The standard deviation is of 0.95.

A similar problem is given at https://brainly.com/question/25653146