The percentage of data lying between values a and b is denoted
The P in this inequality represents the probability or proportion.
On calculating the Normal Distrinution Percentages, we use the z-values.
We have previously learnt how to compute z values
Notably, the process of computing the z-score is called standartization.
For example, consider a distribution N(50,10). The z-score of 55.3 is
Finding the percentages
In computing the percentages under a normal distribution, one has to standardize every value.
for instance, finding in the normal distribution ,
Step 1: one has to standardize a to
Step 2: It involves calculating
Step 3: Look up for the value of in the standard normal tables
Using the example above
Upon looking up for the value of 0.53 in the standard table. The value is 0.7019.
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