Answer
The sample size of greater than or equal to 30 is required to obtain probabilities regarding a sample mean using the normal model (Central Limit Theorem).
Work Step by Step
Given above.
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.