a$)$ Calculate the mean revenue generated per month for a business that earned

$$10,000$ in January, $$12,000$ in February, and $$14,000$ in March.

$[5$ marks$]$

b$)$ If a company has $50$ employees and $30\%$ of them are in management positions,

how many employees are in managerial roles?

$[3$ marks$]$

c$)$ A company's quarterly profits were $$50,000,$$$60,000,$$$55,000,$ and $$65,000$ for the

first, second, third, and fourth quarters, respectively. What is the total profit for the

year?

$[2$ marks$]$

a$)$ If a product has been sold $500$ times and returned $25$ times, what is the return rate

as a percentage?

$[5$ marks$]$

b$)$ Calculate the median annual salary for a company with the following salaries:

$$40,000,$$$45,000,$$$50,000,$$$55,000,$$$60,000,$$$65,000,$$$70,000.$

$[3$ marks$]$

c$)$ If a survey of customer satisfaction yields $85$ responses, and $70\%$ of respondents

are satisfied with the company's service, how many customers are satisfied?

$[2$ marks$]$

a$)$ Calculate the standard deviation of the following set of data: $10,12,14,16,18.$

$[7$ marks$]$

b$)$ If a company's total expenses for the year were $$500,000$ and its revenue was

$$800,000,$ what is the profit margin as a percentage?

$[3$ marks$]$