Given independent random variables Subscript[X, 1] and Subscript[X, 2] , each with Normal[0, 1] distribution, come up with formulas for the cumulative distribution function and probability density function of

David estimated he had about 20 fish in his pond. a year later, there were about 1.5 times as many fish. the year after that, the number of fish increased by a factor of 1.5 again. the number of fish is modeled by f(x)=20(1.5)^x. create a question you could ask that could be answered only by graphing or using a logarithm.