6. Normal Distribution & Continuous Random Variables
Standard Normal Distribution
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Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
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 z-score of 1.21 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 calculator with statistical functions to find the cumulative probability for a z-score of 1.21.
Locate the row in the z-table corresponding to 1.2 and the column corresponding to 0.01 to find the cumulative probability.
Interpret the value from the z-table as the probability that a randomly selected value from the standard normal distribution is less than 1.21.
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