The owner of a catering company wants to select a random sample of clients to find out about their food preferences. select yes or no to tell whether each method results in a random sample of the population. yes or no the owner uses a database to print the names of all clients on slips of paper. the owner chooses 20 of the slips of paper without looking. the owner sends a survey to every client who spent more than $500 with the catering company in the past year. the owner sends a survey to all clients whose phone number ends in 5. the owner sends a survey to the last 20 clients who used the catering company's services.

Select Yes or No to tell whether each method results in a random sample of the population.

1. The owner uses a database to print the names of all clients on slips of paper. The owner chooses 20 of the slips of paper without looking.- yes

3. The owner sends a survey to every client who spent more than $500 with the catering company in the past year. - no

4. The owner sends a survey to all clients whose phone number ends in 5.- yes

5. The owner sends a survey to the last 20 clients who used the catering company's services.- yes

option (b) is correct

step-by-step explanation:

to find the solution of this system, we need to convert it into reduced row-echelon form. we have,

after applying row operations r2 -> r2/2 and r3 -> r3/3, we get,