A survey was conducted to study the smoking habits of UK residents. Below is a data matrix displaying a portion of the data collected in this survey. Note that "ℒ " stands for British Pounds Sterling, "cig" stands for cigarettes, and "N/A" refers to a missing component of the data.

(a) What does each row of the data matrix represent?

(b) How many participants were included in the survey?

(c) Indicate whether each variable in the study is numerical or categorical. If numerical, identify as continuous or discrete. If categorical, indicate if the variable is ordinal.

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1 2 3 1691 sex age Female 42 Male 44 Male 53 Male 40 marital Single Single Married Single grossIncome Under £2,600 £10,400 to £15,600 Above £36,400 £2,600 to £5,200 smoke Yes No Yes Yes amt Weekends 12 cig/day N/A 6 cig/day 8 cig/day amt Weekdays 12 cig/day N/A 6 cig/day 8 cig/day