A company is studying the number of monthly absences among its 125 employees. The following probability distribution shows the likelihood that people were absent 0, 1, 2, 3, 4, or 5 days last month. Number of days Absent | Probability 0 0.60 1 0.20 2 0.12 3 0.04 4 0.04 5 0.001. What is the mean number of days absent? What are the variance and standard deviation?2. For the following probability distribution: a) x|10|11|12|13|14b) P(x)|.1|.25|.3|.25|.13. Find the mean, variance and standard deviation for the following probability distribution.

(1)

(2)

Step-by-step explanation:

Solving (1):

(a): Mean

This is calculated as:

So, we have:

Solving (b): The variance

This is calculated as:

Where:

and

So, we have:

So, we have:

Solving (c): The standard deviation.

This is calculated as:

Solving (2):

(a): Mean

This is calculated as:

So, we have:

Solving (b): The variance

This is calculated as:

Where:

and

So, we have:

So, we have:

Solving (c): The standard deviation.

This is calculated as:

introduction, methodology, results, discussion

step-by-step explanation:

an observational study is one which consists of actual observation to record data and then analyse the data.

there are a number of factors that should be analyzed before starting an observational study.

the main four factors are:

i) introduction:   this should be analysed to check whether the purpose of the study is correctly established and the data recorded are appropriate for the study

methodology:   the method of collecting the data, such as whether randomly selected, and whether sample size matches with the population to be studied, whether questions asked are easy to answer by common men, etc.

results: then results such as summary of data with comments should be studied thoroughly

discussion:   the last is the discussion, this can be either by management people or persons who are all interested , etc.

what is the approximate angle of acb if abc is 25cm and the length of segment bc is 15

step-by-step explanation: