Solve the equations -9x + 2y = 23 and -4x - y = -3
2 answers:
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Answer:
A normal distribution or z-test is used to construct a confidence interval.
Step-by-step explanation:
We are given the following in the question:
Sample mean, = $3120
Sample size, n = 40
Population standard deviation, σ = $677
The distribution of earnings of college is a normal distribution.
Conditions:
- Since we are given the population standard deviation and the the sample size is also greater than 30.
Conclusion:
Thus, we use a normal distribution or z-test to construct a confidence interval.
The median number of telephone line in thousands is 0
The number of telephone lines in each country = 250000
From the given dot plot
The data set will be
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 250, 250, 250, 250, 250, 500, 750, 750, 1000, 1000, 1250, 1750
The median of the data set is the middle term of the ordered data set. The order of the data set maybe ascending or descending order
There are 28 terms in the data set the middle terms will be 14th and 15th
Both 4th and 15 terms are 0
Therefore, the median is 0
Learn more about median here
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