2. Here are the weights (in pounds) of 20 steers on an experimental feed diet: 174,142,131,145,175,150,176,151,110,162,133,163,135,178,178,154,166,146,156,167 a.What is the mean of the data? 154.6 b.What is the median of the data? 155 c.What is the mode of the data? 178 3. The test scores of a class of 20 students have a mean of 71.6 and the test scores of another class of 14 students have a mean of 78.4. Find the mean of the combined group. 4. Explain why the conclusion drawn is not valid: A businesswoman calculates that the median cost of the five business trips that she took in a month is $600 and concludes that the total cost must have been $3000.