Solusi - Probabilitas kumulatif dalam distribusi normal standar

More than $$99,9\%$$ of the time, data with a standard normal distribution lies within plus or minus $$3,9$$ standard deviations of the mean.

The cumulative probability of the values up to $$-4$$ is $$0$$.
$$p\left(x<-4\right)=0$$
The cumulative probability that $$x<-4$$ is $$0\%$$

La probabilidad acumulativa de los valores mayores que $$-4$$ es $$1$$.

$$p\left(x>-4\right)=1$$
La probabilidad acumulativa de $$x>-4$$ es $$100\%$$