The mean age of 5 people in the room is 70 years. A 29-year-old person walks in. Specify how would this change the mean age. Explain your answer using statistical reasoning.
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Answer:mean of people aged =70
People =5
Total age=5×70=350
If 29 is subtract from 350 =350-29=321
Total age =321
Now total people =4
New mean=321÷4=80.25 answer
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