
Concept explainers
a.
To show that the distribution is valid or not.
a.

Explanation of Solution
Given information :
The probability distribution table of a number of each type of jean sold in a particular week is given below:
Proof:
A probability distribution must satisfy the following conditions:
- The probability of each values of the discrete random variable is between 0 and 1.
- The sum of all the probabilities is 1.
Condition 1:
From the table provided in the question, it can be observed that the probability of each values of a number of different type of jean sold in a particular week is between 0 and 1.
Condition 1:
From the table provided in the question,
The sum of all the probabilities is obtained as:
So,
The sum of all the probabilities is 1.
Hence,
the distribution is valid.
[PROVED]
b.
To calculate the probability of choosing pair of jeans with number of stripes less than 3.
b.

Answer to Problem 2CYU
The probability of choosing pair of jeans with number of stripes less than 3 is 0.6.
Explanation of Solution
Given information :
The probability distribution table of a number of each type of jean sold in a particular week is given below:
Calculation:
The probability of choosing pair of jeans with 0 stripe is 0.15.
The probability of choosing pair of jeans with 1 stripe is 0.19.
The probability of choosing pair of jeans with 2 stripes is 0.26.
Therefore,
the probability of choosing pair of jeans with number of stripes less than 3 is obtained as:
Hence,
The probability of choosing pair of jeans with number of stripes less than 3 is 0.6.
c.
To draw a probability graph of the given distribution table.
c.

Explanation of Solution
Given information :
The probability distribution table of a number of each type of jean sold in a particular week is given below:
Graph:
To draw the probability graph of the given distribution table,
Draw a histogram by plotting each values of the probability along vertical axis and number of stripes along horizontal axis and superimpose the normal density function on the histogram.
The graph is obtained as:
Interpretation:
From the above graph, it can be observed that the jean with 2 strips has maximum probability of occurrence.
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