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SUMMARY:Standard Deviation
DTSTART;TZID=America/Los_Angeles:20260407T190000
DTEND;TZID=America/Los_Angeles:20260407T200000
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DESCRIPTION: 

The standard deviation,  , is a measure of how ‘spread out’ numbers are or how much they vary from the mean. To illustrate, let’s consider the following sets of data.
Mathematics: 4, 5, 6, 7, 8
English: 1, 3, 6, 9, 11
For both subjects, the mean score is 6.
In the diagram, the dots represent the mathematics marks and represents the english scores. The mean of 6 is indicated by the horizontal line at 6. It can be seen that the english scores are further away from the mean than the mathematics scores. Therefore, the standard deviation for the english scores is higher than those for the mathematics scores. There is a greater variation in the english scores from the mean. (This can be clearly seen in the diagram.)
At this level, we are not required to calculate the value of the standard deviation. All that is needed is the ability to interpret its meaning.
Consequently, if we compare the mathematics scores and the english scores we would have to say, based on the standard deviations,...

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