The area under the standard normal curve to the left of z = 1.25 is 0.8944.
What is a normal distribution?
A function that reflects the distribution of numerous random variables as a symmetrical bell-shaped graph is said to be in a normal distribution.
What are z-scores?
A z-score (also known as a standard score) indicates how much a data point deviates from the mean.
How to read the z-score table?
After computing the z-score (standardized score), we must use the z-table to get the area (same as probability). First, we locate the first two numbers on the left side of the z-table. Then we search for the last numbers in the table (on the top). The value at the junction of the row and column is the equivalent area.
How to solve the question?
In the question, we are asked to find the area under the standard normal curve to the left of z = 1.25.
We know that to find the area under the curve for a z-score, we need to use the z-score table.
For our value of z = 1.25, we first take the first two digits = 1.2 and check for this on the left of the table. It is in the 13th row.
Then, we look for the remaining 0.05 at the top of the table. It is in the 6th column.
The intersection of this row and column gives us the area to the left of z = 1.25, which is 0.8944.
Learn more about standard normal curves at
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