An instructor has found that times spent by students on a particular homework assignment follow a normal
Question:
An instructor has found that times spent by students on a particular homework assignment follow a normal distribution with mean 150 minutes and standard deviation 40 minutes.
(a) The probability is .9 that a randomly chosen student spends more than how many min- utes on this assignment?
(b) The probability is .8 that a randomly chosen student spends less than how many min- utes on this assignment?
(c) Two students are chosen at random. What is the probability that at least one of them spends at least two hours on this assignment?
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