It is known that people who buy lottery tickets regularly spend approximately $3

It is known that people who buy lottery tickets regularly spend approximately $30 a month on them, with a standard deviation of $5. Find the probability that such a person will spend at least $20 per month on lottery tickets. If 100 individuals who buy lottery tickets regularly are sampled, find the mean and standard deviation of those who spend at least $20 per month on lottery tickets.

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