1a. Creating a histogram for employee satisfaction .

TAKEAWAY : Most of the employees have a satisfaction level of 0.5
and above.
1b. Create a histogram for and last evaluation.

TAKEAWAY: The majority of employees were rated between 0.5 and 0.8,
showing that most of the employees perfomed average to good
2. Create a bar plot for the average satisfaction of employees by
the variable that indicates whether they left of stayed at the
company.
TAKEAWAY: Employess who stayed are 50% more satisfied than employees
who left.