For a Variable Z That Has a Standard Normal Distribution $z < - 2.45$

For a variable z that has a standard normal distribution, a) What is the probability that $z < - 2.45$ ?
b) What is the probability that $z < + 1.67$ ?
c) What is the probability that $\mathrm { z }$ is between $- 1.43$ and $+ 1.43$
d) What value of $z$ separates the smaller $10 \%$ of the standard normal distribution from the larger $90 \%$ ?
e) What values of $- z$ and $+ z$ separate the middle $95 \%$ of the standard normal distribution from the extreme $5 \%$ ?