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Answer:
Answer 2
Step-by-step explanation:
the number are being added together based on their position
Answer:

Step-by-step explanation:







Hope I helped!
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I guess that u = μ & that a=σ. If so:
μ =100 & that σ =20 & x=20
Z score = (x-μ) / σ ==> Z score = (90-100)/20 ==> Z = - 0.5