Answer: They originally thought they were paying £1680
Step-by-step explanation:
1680+12.5%1680= 1890
1680+210=1890
1890=1890
Answer:
a) cluster sampling
Step-by-step explanation:
In cluster sampling method, each member of a population is assigned to one and only one group.This means clusters are formed through probability method usually a simple random sampling.The participants in the clusters are the only one to be surveyed.
In this example, simple random sampling is used to identify 12 home rooms(cluster) where a group of 20 students (participants) in each room is given the survey.
Y=-9x because y=mx+b is the formula so plug in the slope, m(-9) and the x-intercept, x(0)
