An investigator is interested in examining if drinking wells are contaminated with a toxin, the toxin is found in 29% of the wells within the region. 7 drinking wells were examined, they have selected the 7 wells so they are far enough apart from one another so the results of one drinking well provides no information as to the status of any other well in the study. a) What is the probability that exactly 3 of the wells in the study are contaminated. b) What is the mean and standard deviation of the number of drinking wells in a sample of thi

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Q: There were 20 multiple choice questions on Exam 2. The probability of getting the right answer on…

A: Given Information: n=20p=25%=0.25To find out the probability that a student who did not study would…

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Q: 2. In a factory that produces pieces of ready-made concrete, if the percentage of producing…

A: Given,n=5p=0.6q=1-p=1-0.6=0.4X=no.of defective piecesX~Binomial (n=5 , p=0.6)P(X=x)=nx px qn-x    ;…

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Q: There are 74 players who play a chess game against the Computer. Each player plays 12 times and the…

A: From the given information we find the solution.

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A: Solution: Let X be the number of employees will be likely to be laid off and n be the sample number…

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Q: 1)Suppose that you randomly draw one card from a deck of 52 cards. After writing down which card you…

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Q: Suppose a professor wants to know if students in her statistics class have a good grasp of basic…

A: Given: Sample size n=6 Sample mean x¯=∑i=1nXin=62+92+75+68+83+956=79.167 Sample standard deviation…

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Q: Among the students of AUCA, 80% are involved in different projects. Find the mean and the standard…

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Q: Determine which of the following options best describes the main purpose for using Figure 2. O…

A: Given :  We have given a box plot which useful to find five number summary and check whether the…

Q: 5) A test consists of 40 multiple-choice questions. Each question has four possible answers, one of…

A: Given information Number of questions n = 40 Probability of correct answer p = ¼ = 0.25 Mean µ = np…

Q: In an experiment with 49 degrees of freedom, value was found to be 62-7. What is the chance that in…

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Q: The overall defect rate in making an electronic device is also 5%. What is the probability that more…

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Q: What is the probability of observing a z score greater than 3?

A: From the provided information, The z score is greater than 3. That is P (z > 3)

Q: Now that weddings can be held again you end up being invited to one and you decide to observe the…

A: Given: P( dance track) = =0.2 P( pop song) = 0.3 P( rock song)= 0.15 P( hip hop song) = 0.35  All…

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Q: 9. During an independent research, 2500 randomly selected people were interviewed whether they visit…

A: Given The data is as follows:Sample size, n=2500 Sample proportion, p=0.7

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Q: of 50 carpenters finds that 30 are journeymen and 20 are master carpenter Of the journeymen, 10…

A: A survey of 50 carpenters finds that 30 are journeymen and 20 are master carpenter Of the…

Q: The height of women ages​ 20-29 is normally​ distributed, with a mean of 63.8 inches. Assume σ=2.6…

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Q: An experiment consists in asking 8 people whether they have a college degree, and counting the…

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Q: It is reported that 20% of the buildings in a city, have isolation coating. What is the probability…

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Q: Find the 90th percentile.

A: It is very useful in statistics . It is highly used nowadays .

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Q: research team is working on a project to study the time (in seconds) for high school male runners to…

A: According to guideline we solve first three subparts only when given multiple subparts.

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