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1-Determine if asking 100 people which brand of car they drive is a binomial experiment or not. Explain. 2-Does the mean of a normal distribution

1-Determine if asking 100 people which brand of car they drive is a binomial experiment or not. Explain.

2-Does the mean of a normal distribution is always positive? How about the standard deviation?

3-What is the z-score for the value that is two standard deviations away from the mean?

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