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A sports centre records the number of visits at consecutive observation times. The table gives each period index with its recorded value

The observations are in chronological order

Sports-centre visits
PeriodWeek 17Week 18Week 19Week 20Week 21Week 22Week 23Week 24Week 25
Period index123456789
Sports-centre visits (visits)1,4821,4351,3251,3501,1741,130950941934
(a)1 mark

Which variable belongs on the horizontal axis?

(b)1 mark

Which cartesian plot is constructed correctly from the table?

(c)1 mark

What was the recorded Sports-centre visits at Week 21? Give the answer in visits