Reading # 9

Hi,

can someone help me to understand this question?

The probability that a normally distributed random variable will be more than two standard deviations above its mean is:

a) 0.9772
b) 0.0228
c) 0.4772

Why the answer “b” is correct? I think its “a”.

0.9772 is the probability than a normally distributed random variable will be two standard deviations above its mean or less, not that it will be more than two standard deviations above its mean.