The art club has 12 members who are sixth graders 18 members who are seventh graders and 10 members who are eighth-graders. What
1 answer:
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Answer:
z=3.8196
Step-by-step explanation:
-We notice that this is a normal distribution problem.
-Given the mean is $8500, standard deviation is $1200 , and n=350, the critical z-value using alpha=0.05 is calculated as:
Hence, the test statitic is z=3.8196