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Cambridge A Levels A2 Biology Practical Skills for A Level
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Practical Skills for A Level: 26 pages Sick of reading textbooks full of nonsense and gibberish? Hard to study with your teacher's notes? Lazy to do your own notes? Can't find any online notes that are extensive enough and always leave out something from the syllabus? Look no further !! This se...

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Document information

  • May 19, 2024
  • 26
  • 2023/2024
  • Class notes
  • Chia hon lam
  • All classes

Subjects

  • biology
  • cambridge a levels
  • a2 bio notes
  • practical skills
  • lab
  • calculations

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  • Secondary school
  • Cambridge A Levels A2 Biology
  • 5
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Practical skills for A Level
1. Mean, Median and Mode
mean: average value
mode (modal class): the most common value, or class, in the set of results
median: the middle value of all the values in the data set
∑𝑥
𝑥̅ =
𝑛
Eg:
A large lemon tree has several hundred fruits on it. Imagine that you have measured the masses of 40
lemons from this tree. These are the results,
57, 60, 67, 72, 72, 76, 78, 79, 81, 83, 84, 86, 87, 88, 88, 90, 92, 92, 93, 94, 95, 97, 98, 99, 100, 101, 101,
103, 105, 106, 107, 109, 111, 113, 119, 120, 125, 128, 132, 135

Mean=3823/40=96

The modal class is the most common class in the set of results. For these results, the modal class is 90–
94 g.
The median is the middle value of all the values in the data set. The median value is half way between
the smallest mass (57g) and the largest (135 g), which is 96g. You can also identify the median class,
which is the middle class on the graph, in this case 95–99 g.

,2. Range
Range: the spread between the smallest number and the largest.
For the fruit masses, the range is from 57 g to 135g.



3. Normal Distribution
a set of data in which a graph shows a symmetrical distribution around the central value.




4. Standard Deviation
a calculated value that indicates how widely a set of data spreads out from the mean value

The larger the standard deviation, the wider the variation from the mean.

, ∑(𝑥 − 𝑥̅ )2
𝑠=√
𝑛−1

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