The probability of an event under conditions of certainty is 1.0, not less than 1.0.
More that one outcome is not a characteristic of the conditions of certainty.
When there is no doubt that an event will occur, the probability of the event is 1.0 or 100%, which happens only under a condition of absolute certainty. Under conditions of certainty, conditions are deterministic and known and the probability is either 1.0 or 100% (event occurs) or 0% (event does not occur).
The standard deviation of a distribution is expressed in the same type of units as the distribution is expressed in. That is, if the distribution is a distribution of possible rates of return (i.e., percentages), one standard deviation will be a rate of return, or percentage, amount. If the distribution is a possible distribution of units such as sales volume, one standard distribution will be a number of units sold. Absolute certainty would exist only if the standard deviation of the event were exactly zero.
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