Answer:
cluster sampling
Step-by-step explanation:
ideal groups of objects are naturally chaos arranged in groups, and randomly selected. Unlike class sampling, with homogeneously arranged groups and only a few randomly selected objects from each group, in cluster sampling, each group is allocated in a chaotic and all objects in the group become part of the sample.
C= 20.25
Half of 9 is 4.5 and 4.5 x4.5= 20.25
Answer:
quadratic
Step-by-step explanation:
<span>They arrive at a ratio of 10 flights to every 15 minutes which is 10:15. There are 4 x 15 minutes in an hour of 60 minutes. 10 x 4 is 40. The ratios are 10:15 and 40:60.</span>