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2. A random sample of birth weights of male elephants is taken. a. Make a stern plot of the data (supplied below and in an Excel file). b. Find a 98% confidence interval for the mean birth weight of captive male elephants. Weights in kg. 151 140 138 131 147 175 130 130 136 136 142 142 130 139 154 138 130 172 131 158 142 127 174 Source: http:ffwww.elephant.se/elephant_birth_weights.php