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Square the standard deviation and you will have the variance.
The probability of Z from minus infinity to -1.96 is 0.025. Therefore the probability of Z greater than -1.96 is 1 - 0.025 or 0.975 or 97.5%.
From the related link, you can read directly the probability that Z is less than 1.51 is 0.9345.
Given a set of numbers, and its mean, we can find the difference between each of the numbers and the mean. If we take the mean of these differences, the result is called the mean deviation of the numbers.
49.30179172 is the standard deviation and 52 is the mean.