### 1.1.3 State the meaning of the term standard deviation

Standard deviation is used to summarize the spread of values around the mean. 68 percent of all values lie within plus or minus 1 standard deviation of the mean. 95 percent of all values lie within plus or minus 2 standard deviations of the mean. The IB expects you to know these percentages. Here I show you how to calculate the range of data containing 68 or 95 percent of your data when given the mean and standard deviation.

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