Q: In a Normal Distribution Curve, The area to the left of 1SD is:

a. 0.16
b. 0.34
c. 0.45
d. 0.84

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Ans: d. 0.84

total area = 1;

area to left of median = 0.5;

area between median and +1SD = 0.34;

so total area to left of +1SD = 0.5 + 0.34 = 0.84