Intro to Stats and Analytics

Question

For a standard normal distribution, find:

P(z < -2.42)

Round your probabilty accurate to 4 decimal places.

Answer 1

Hi Lucy,

Standard normal means the mean (mu) is 0 and standard deviation (sigma) is 1. Working that out:

z = (x-mu)/sigma

z= (x-0)/1

z=x= -2.42

From z-table:

P(Z< -2.42) = 0.0078

I hope this helps.