Can someone pls help me in understanding the solution to this problem:

" the probabilities can be taken from a normal table, in which the critical z-values are 2 & 3 and we are including the probabilities in both tails. the probabilities that the exchange rate will be at least 2, or 3 standard deviations away from the mean are:

P(|x-u| >=2std) = 0.0456

P(|x-u|>=3std) = 0.0026

i don t understand the notation, and the corresponding values, unless i’m looking at this problem in the wrong way. PLs help…