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 2 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 (CaCO3) and the other a barium-containing 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 57.17%, 57.68%, or 57.43% barium in the specimen. What was the average barium percentage in the specimen? Round your answer to the nearest hundredth of a percent.
 3 11 tons of granite were removed from the quarry on Tuesday, 18 tons on Wednesday and on Thursday an amount equal to the average removed on the two previous days was removed. What was the average amount of granite removed per day over the three-day period? Round your answer to the nearest tenth, if needed.
 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 8 ?
 5 Kaylee made three specific gravity determinations on some samples of the mineral linarite (a sulfate of lead and copper). The average specific gravity she obtained was 5.1. Two of her measurements were 5.24 and 5.26, What was her third measurement?
 6 Mr. Bloop made a collection of minerals and fossils from Big Sandy Creek. On his first trip, 14% of his specimens were fossils. On his second trip, 11% of his specimens were fossils. On his third trip, 16% were fossils. On his fourth and final trip, 13% 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.