1. A buyer for a lumber company must decide whether to buy a piece of land containing 5,000 pine trees. If 1,000 of the trees are at least 40 feet tall, the buyer will purchase the land; otherwise, he won't. The owner of the land reports that the height of the trees has a mean of 30 feet and a standard deviation of 3 feet. Based on this information, what is the buyer's decision? 2. Relevant equations By Chebyshev’s Theorem (1-1/K2 ) 3. The attempt at a solution By Chebyshev’s Theorem (1-1/K2 ) 1000/5000= 1/5 = 1-1/K2 so 1/K2 = 1-1/5 = 4/5 so K = 1.118, so 20% fall between 26.646 and 33.354 So I advise against . Is this right?