Question

we do:
a company has 300 employees: 180 in production, 90 in sales, 30 in administration. if we need
a sample of 30, how man will be selected from each group?

Explanation:

Step1: Calculate the proportion

The proportion of the sample is $\frac{30}{300}=\frac{1}{10}$.

Step2: Calculate the number of employees from production

Number of employees from production: $180\times\frac{1}{10} = 18$.

Step3: Calculate the number of employees from sales

Number of employees from sales: $90\times\frac{1}{10}=9$.

Step4: Calculate the number of employees from administration

Number of employees from administration: $30\times\frac{1}{10} = 3$.

Answer:

18 from production, 9 from sales, 3 from administration.