The larger the value of the standard deviation, the more the data values are scattered and the less accurate any results are likely to be.
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The standard deviation of the population. the standard deviation of the population.
The standard deviation is 0.
The standard deviation in a standard normal distribution is 1.
The standard deviation, in itself, cannot be high nor low. If the same measurements were recorded using a unit that was a ten times as large (centimetres instead of millimetres), the standard deviation for exactly the same data set would be 1.8. And if they were recorded in metres the sd would be 0.018
You need more than one number to calculate a standard deviation, so 9 does not have a standard deviation.