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Page 1

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+BOVBSZ
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%JTDSFUFEBUB
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2. Cotinine is a chemical that is made by the body from nicotine which is found in cigarette
smoke. A doctor tested the blood of 12 patients, who claimed to smoke a packet of
cigarettes a day, for cotinine. The results, in appropriate units, are…

Page 2

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January 2011
a) Discrete data
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2. Keith records the amount of rainfall, in mm, at his school, each day for a week. The results
are given below.

2.8 5.6 2.3 9.4 0.0 0.5 1.8

Jenny then records the amount of rainfall, x mm, at the school each day…

Page 3

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January 2011
b) Continous data
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5. On a randomly chosen day, each of the 32 students in a class recorded the time, t minutes
to the nearest minute, they spent on their homework. The data for the class is summarised
in the following table.


Time, t Number of…

Page 4

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January 2013
b)Continous data
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5.




Frequency
density




0 5 10 15 20 25 30 35 40 45 50
Speed of car

Figure 2

A policeman records the speed of the traffic on a busy road with a 30 mph speed limit.
He records the speeds of a sample…

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daviesg

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A good set of exam questions on mean and variance (also reading from a histogram)

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