The shaded area of the curve represents the probability. This is demonstrated in the graph below for a 0.5. Note that for z = 1, 2, 3, one obtains (after multiplying by 2 to account for the interval) the results f( z) = 0.6827, 0.9545, 0.9974, This can be used to compute the cumulative distribution function values for the standard normal distribution.
How to read a standard normal table driver#
What is the probability that a teenage driver chosen at random.
How to read a standard normal table drivers#
If X is a random variable from a normal distribution with mean μ and standard deviation σ, its Z-score may be calculated from X by subtracting μ and dividing by the standard deviation: Standard Normal Distribution Examples Example 1 Suppose the reaction times of teenage drivers are normally distributed with a mean of 0.53 seconds and a standard deviation of 0.11 seconds.