6. Normal Distribution and Continuous Random Variables
Standard Normal Distribution
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Find the area under the standard normal distribution to the left of a z-score of .
A
0.1131
B
0.8869
C
0.8849
D
0.1151
Verified step by step guidance1
Understand that the problem is asking for the cumulative probability to the left of a given z-score in a standard normal distribution.
Recall that the standard normal distribution is a normal distribution with a mean of 0 and a standard deviation of 1.
Use a standard normal distribution table (z-table) or a statistical software to find the cumulative probability associated with the z-score of 1.21.
Locate the z-score of 1.21 in the z-table. The table provides the area to the left of the z-score, which is the cumulative probability.
Interpret the value from the z-table as the probability that a randomly selected score from the standard normal distribution is less than 1.21.
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