The lower and upper deciles of any distribution are the points that mark off the lowest 10% and the highest 10%. What are the lower and upper deciles of the standard normal distribution?
The lower and upper deciles of any distribution are the points that mark off the lowest 10% and the highest 10%. What are the lower and upper deciles of the standard normal distribution?
Use your tables in an inverse way to find:
1. The value of a such that Pr(Z < a) = 0.1.
2. The value of b such that Pr(Z > b) = 0.1 <=> 1 - Pr(Z < b) = 0.1 <=> Pr(Z < b) = 0.9.
By symmetry you should realise that in fact a = -b.