Question: Please help me solve this? I think the population standard deviation is 21.47092, I'm not sure but I am so lost, the book is no

Please help me solve this? I think the population standard deviation is 21.47092, I'm not sure but I am so lost, the book is no help! Please help me!

MBA Applicant Work Experience
One Sample Test for the Mean
Sample Size 47
Sample Mean 3.1
Population Variance 0.5
Population Standard Deviation
Hypothesized value 3
Level of significance 0.05
Hypothesis:
H0:
H1:

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