Of the following ecosystem types, which have been impacted the most by humans?

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#Question id: 16787

#Section 3: Mathematics and Quantitative Ecology

The following observations are arranged in ascending order. The median of the data is 15 find the value of x. 

8, 11, 12, x + 6, 17, 18, 23 

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#Question id: 16789

#Section 3: Mathematics and Quantitative Ecology

The median of number 50, 48, 47, 48.5, 50.5, 52, 48.8, 46 will be: 

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#Question id: 16790

#Section 3: Mathematics and Quantitative Ecology

For the moderately symmetrical distribution of age of the employees, mean = 20 and mode = 25. The approximate value of the median is: 

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#Question id: 16791

#Section 3: Mathematics and Quantitative Ecology

The mode of a distribution is 24 and the mean is 60. What is its median? 

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#Question id: 16874

#Section 3: Mathematics and Quantitative Ecology

A randomly selected sample of 1,000 college students was asked whether they had ever used the drug Ecstasy. Sixteen percent (16% or 0.16) of the 1,000 students surveyed said they had. Which one of the following statements about the number 0.16 is correct?

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#Question id: 16875

#Section 3: Mathematics and Quantitative Ecology

In a random sample of 1000 students, pˆ = 0.80 (or 80%) were in favor of longer hours at the school library. The standard error of pˆ (the sample proportion) is