Mathematics, 22.04.2020 04:45 rocky68
Unfortunately, arsenic occurs naturally in some ground water†. A mean arsenic level of μ = 8.0 parts per billion (ppb) is considered safe for agricultural use. A well in Texas is used to water cotton crops. This well is tested on a regular basis for arsenic. A random sample of 41 tests gave a sample mean of x = 7.2 ppb arsenic, with s = 2.1 ppb. Does this information indicate that the mean level of arsenic in this well is less than 8 ppb? Use α = 0.01.
Answers: 1
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Which expression is rational? 6. , square root two, square root 14, square root 49
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Mathematics, 22.06.2019 02:00
Sammie has 3 times as many goldfish as nora. nora has 4 goldfish. how many goldfish do sammie and nora have in all?
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Mathematics, 22.06.2019 04:00
Fifty students are trying to raise at least 12,500 for a class trip. they have already raised 1,250. how much should each student raise on average in order to meet the goal? write and solve the two step inequality for this problem
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Mathematics, 22.06.2019 05:30
Marshall went to the state fair and bought 3 tickets. each ticket to the fair cost x dollars. after he bought the tickets, he had $3.25 left in change. write an expression that represents the amount of money, in dollars, that marshall had before he bought the tickets. n
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Unfortunately, arsenic occurs naturally in some ground water†. A mean arsenic level of μ = 8.0 parts...
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