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Exam-Style Question on Box Plots

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Question id: 496. This question is similar to one that appeared on a GCSE Higher paper in 2019. The use of a calculator is not allowed.

Poppy Pringle recorded the heights in centimetres of the sunflowers growing in her brother's and sister's gardens.

Sunflower

Here are the heights of the 19 sunflowers in her brother's garden:

$$94, 103, 110, 111, 123, 143, 150, 150, 151, 156, 157, 160, 170, 182, 201, 220, 250, 255, 231$$

(a) Complete the table below to show information about this data.

Median        
Lower quartile 
Upper quartile 
Shortest 
Tallest 

Here is some information about the sunflowers in Poppy's sister's garden:

Median160
Lower quartile143
Upper quartile172
Shortest110
Tallest199

Poppy says that the sunflowers in her brother's garden are shorter that those in her sister's garden.

(b) Is Poppy correct?

You must give a reason for your answer.

Poppy says that the sunflowers in her brother's garden vary more in height than those in her sister's garden.

(c) Is Poppy correct?

You must give a reason for your answer.

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Dent

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