Suppose the variable x is represented by a standard normal distribution.

Question

What value of x is at the 70th percentile of the distribution? Equivalently, what is the value for which there is a probability of 0.70 that x will be less than that value?

Answer 1

Hi Robert, for a problem like this, you want to take a look at the Z table of a standard normal distribution and see what z-score gets you to the 70th percentile (the shaded area of the curve to the left of your z-score needs to be 0.7).

 

Hope this helps!