Question: 7. What is the arithmetic average mean? 8. What is the difference between Descriptive Statistics and Statistical Inference? 9. A group of 15 friends have

7. What is the arithmetic average mean? 8. What is the difference between Descriptive Statistics and Statistical Inference? 9. A group of 15 friends have different ages. They are as follows: 7 of them are 38 years old and another 6 are 32 years old, the rest are 29 and 30 years old respectively. Find the arithmetic mean of the group

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