A population has mean 75 and standard deviation 12. Random samples of size 121 are taken. Find the standard deviation of the sample mean distribution. а. 1.09 b. 1.90 c. 0.19 d. 1.9 How would the...

Need the correct answer in the 2 questions. Provide solution in each, I will give an upvote if you solve this 2 questions. Thank you.

Extracted text: A population has mean 75 and standard deviation 12. Random samples of size 121 are taken. Find the standard deviation of the sample mean distribution. а. 1.09 b. 1.90 c. 0.19 d. 1.9 How would the answers to part (a) change if the size of the samples were 400 instead of 121? a. 0.60 b. 0.80 c. 0.75 d. 0.70