Standard Deviation = (principal value of) the square root of Variance.
So SD = 10.
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Standard deviation is the square root of the variance. Since you stated the variance is 4, the standard deviation is 2.
A sample of size 100.
Z = (x-mu)/sigma. So, for your example, any x value can be transformed to Z-score by the formula Z = (x-100)/20.
The probability of scoring an exact value for a continuous variable is zero for any value. The probability of scoring 115 (or more) is 15.87%
To write "Forty Hundredths" in standard form, you need to convert the fraction into a decimal. "Forty Hundredths" is the same as 40/100. When you simplify 40/100, you get 0.40. Therefore, "Forty Hundredths" in standard form is 0.40.