Standard deviation of tighter probability distribution is

long-termed
short-termed
risky
smaller

The correct answer is D.

Standard deviation is a measure of how spread out numbers are in a data set. A lower standard deviation indicates that the data points tend to be very close to the mean, while a higher standard deviation indicates that the data points are spread out over a wider range of values.

A tighter probability distribution is one in which the data points are more closely clustered around the mean. This means that the standard deviation of a tighter probability distribution will be smaller than the standard deviation of a wider probability distribution.

Option A is incorrect because standard deviation is not a measure of time.

Option B is incorrect because standard deviation is not a measure of risk.

Option C is incorrect because standard deviation is not a measure of how likely an event is to occur.

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