To find the mean add up all the numbers given then divide your answer by how many numbers there are. for ex: 1,2,3,4,5 1+2+3+4+5= 15 15 divided by 5 = 3 so the mean is 3
Answer: The sampling frame is 400 and the sample 250.
Step-by-step explanation:
The sampling frame is a list of elements used to determine the samples. The sampling frame contains 400 senior citizens of which 250 samples were interviewed.