1. In a shooting competition, a participant hits the target at any shot with a probability of 0.5. What is the minimum number of shots needed to make the probability of at least 8 hits equal to or greater than 0.9? 2. A barber must serve 8 customers everyday to cover the infrastructural costs. His number of customers per day has a mean of 10. What is the probability that he will serve less than 8 customers a day?
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