Find the area under the standard normal distribution to the left of a z-score of $1.21$.

• A. 0.1131
• B. 0.8869
• C. 0.8849
• D. 0.1151

Answer: (B)

Verified step by step guidance

1. Understand that the problem is asking for the cumulative probability to the left of a given z-score in a standard normal distribution.
2. Recall that the standard normal distribution is a normal distribution with a mean of 0 and a standard deviation of 1.
3. 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.
4. 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.
5. 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.