Dr. J's Maths.com

**Where the techniques of Maths**

are explained in simple terms.

are explained in simple terms.

Data presentation - Stem & Leaf plots.

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8. The number of people attending a Vaccination Centre for the Astra jab was recorded at the end of each two hour time period for 3 days. The date are summarised in the following stem & leaf plot:
(i) The range over these 3 days of the number of patients in a 2 hour period was 42. What is the missing number (*) in the data? (ii) What was the mode number of patients attending across the two hour periods? (iii) What was the inter-quartile range for the number of patients attending across the two hour periods? (iv) How many patients attended the Centre within the inter-quartile range? (v) Write down a five figure summary for this set of observations. Answer.(i) * = 13.(ii) Mode is 36 patients in the 2 hour period. (iii) IQR = 20.5. (iv) 449 patients attended. (v) [13, 26.5, 37, 47, 55]. |
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15. The ages of people attending a meeting of the local sports club are recorded in a table separately for males and females.
What is the median age of the females who attended? Answer.Median = 28. |
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