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I cant fugure out which formual to use Question 1 (Non-Software Part). The annual income of certified welders is distributed with a standard deviation of

I cant fugure out which formual to use

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Question 1 (Non-Software Part). The annual income of certified welders is distributed with a standard deviation of $3,700. Exploring tax documents of 51 members, the Building Association finds out that on average they had earned $51,200 last year and now wishes to check if a welder's mean income is around $50,000 annually. Explain your statistical inference on this case. (15 Points)

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