MED 7300 Midterm: STAT 145 UMN Exam3 Spring13
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What is the probability that a single randomly selected smoker in the u. s, spends more than ,350 each year on cigarettes? (b) (5 pts. ) What is the probability the average of 10 randomly selected smokers in the u. s. spends more than. ,350 each year on cigarettes: a spinner can land on numbers 1, 2, or 3. Each of these outcomes is equally likely. (a) (4 pts. ) If the spinner is spun twice and the sum of the two spins is recorded, what is the sample space? (b) (3 pts. ) What is the probability the sum will be 4? (c) (4 pts. ) Let a be the event the first spin is 1. Let b be the event the second spin is even. Explain if events a and b are or are not disjoint: a random sample of 49 four-year public colleges has a mean annual tuition of ,900.
