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Mathematics, 21.03.2020 03:04, marlandwilliams10
A quality control expert at LIFE batteries wants to test their new batteries. The design engineer claims they have a standard deviation of 55 minutes with a mean life of 1141 minutes. If the claim is true, in a sample of 55 batteries, what is the probability that the mean battery life would be greater than 1132.1 minutes? Round your answer to four decimal places.
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Mathematics, 21.06.2019 18:00, kezin
The sat and act tests use very different grading scales. the sat math scores follow a normal distribution with mean 518 and standard deviation of 118. the act math scores follow a normal distribution with mean 20.7 and standard deviation of 5. suppose regan scores a 754 on the math portion of the sat. how much would her sister veronica need to score on the math portion of the act to meet or beat regan's score?
Answers: 1
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Mathematics, 21.06.2019 19:00, ale1910
Quick! a survey of 57 customers was taken at a bookstore regarding the types of books purchased. the survey found that 33 customers purchased mysteries, 25 purchased science fiction, 18 purchased romance novels, 12 purchased mysteries and science fiction, 9 purchased mysteries and romance novels, 6 purchased science fiction and romance novels, and 2 purchased all three types of books. a) how many of the customers surveyed purchased only mysteries? b) how many purchased mysteries and science fiction, but not romance novels? c) how many purchased mysteries or science fiction? d) how many purchased mysteries or science fiction, but not romance novels? e) how many purchased exactly two types of books?
Answers: 3
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A quality control expert at LIFE batteries wants to test their new batteries. The design engineer cl...
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