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The random variable x is the number of occurrences of an event over an interval of ten minutes. it can be assumed that the probability of an occurrence is the same in any two-time periods of an equal length. it is known that the mean number of occurrences in ten minutes is 5.3. the appropriate probability distribution for the random variable

If f(x)=3x+1 and f^-1=x-1/3, then f^-1(7)=

For the following geometric sequence, find the recursive formula. {-80, 20, -5, } i need : ')