College Math

College Math Study Guide

4. c Solution: The promotion cost is estimated to be 10% of the total cost. Hence, the total cost incurred for publishing the book is to be calculated first. Then, we know that royalty accounts to be 15% of the total cost, hence, we would find 15% of total cost to fetch the answer. We know that, 10% of total cost = 15780 100% of total cost = 15780/10*100 = 157800 Royalty cost = 15% of total cost = 15/100*157800 = $23670 5. c Solution: In this case, we would draw the frequency distribution table and then will work out the calculations for mean. Cars sold per day Frequency Cars sold per day* frequency 0 5 0*5 = 0 1 7 1*7 = 7 2 5 2*5 = 10 3 5 3*5 = 15 4 4 4*4 = 16 5 2 5*2 = 10 6 2 6*2 = 12 Sum 30 70 Mean = 70/30 = 2.33

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