There must be a formula, but in the mean time there is a handy site that does it for you. [See related link below for the converter]
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Standard Deviation = (principal value of) the square root of Variance. So SD = 10.
Information is not sufficient to find mean deviation and standard deviation.
Standard deviation is the square root of the variance.
One standard deviation for one side will be 34% of data. So within 1 std. dev. to both sides will be 68% (approximately) .the data falls outside 1 standard deviation of the mean will be 1.00 - 0.68 = 0.32 (32 %)
Standard deviation is a statistical concept and not applicable to concrete.