1. 
Mr. Bloop made a collection of minerals and fossils from Big Sandy Creek. On his first trip, 13% of his specimens were fossils. On his second trip, 9% of his specimens were fossils. On his third trip, 16% were fossils. On his fourth and final trip, 9% of his specimens were fossils. What was the average percent of his daily collection that consisted of minerals? Round your answer to the nearest hundredth of a percent, if needed.


2. 
Jordan made an analysis of the hornfels in the local gneiss found at Buckthorn Butte. She analyzed the gneiss on three different occasions and obtained the three following sets of data for the percent hornfels in the gneiss: Set A = {4.1, 5, 5.1, 5, 4.3, 5.5, 5.5, 4.3, 4.4, 4.4}, Set B = {5.5, 5, 5.1, 5.1, 3.4, 3.6, 4.4, 5.1, 5.1, 3.4}, Set C = {5.9, 3.6, 5.6, 5.5, 5.9, 3.8, 5.9, 4.4, 4.9, 5.9}. Which set of data had the greatest mode?


3. 
Professor Blurp of the local museum tested some unidentified mineral specimens that had recently been donated by a mineral club. He wasn't sure, but he thought one might be aragonite (CaCO_{3}) and the other a bariumcontaining mineral. They were of a similar color but one seemed more dense. He measured the barium content in the minerals using an electron microprobe and found one had very little barium. However, the other mineral was found to have barium. Depending on which part of the mineral he tested he found 62.35%, 62.8%, or 62.54% barium in the specimen. What was the average barium percentage in the specimen? Round your answer to the nearest hundredth of a percent.


4. 
Moh's hardness scale ranges from 1 to 10 and describes different minerals in terms of their hardness. Gypsum is the softest mineral on the scale (hardness of 1) and diamond is the hardest mineral on the scale (hardness of 10). In a collection of 10 minerals, each with an integer hardness value different from any other mineral in the collection, what is the probability of randomly choosing a mineral from the collection that has a hardness greater than 4 ?

