The amount people who pay for electric service varies quite a bit, but the mean monthly fee is $168 and the standard deviation i
s $34. The distribution is not Normal. Many people pay about $90 in rural areas of the country and about $150 in urban areas of the country, but some pay much more. A sample survey is designed to ask a simple random sample of 1,200 people how much they pay for electric services. Let xbar be the mean amount paid. Part A: What are the mean and standard deviation of the sample distribution of xbar? Show your work and justify your reasoning. (4 points) Part B: What is the shape of the sampling distribution of xbar? Justify your answer. (2 points) Part C: What is the probability that the average electric service paid by the sample of electric service customers will exceed $170? Show your work. (4 points)
1 answer:
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Answer:
Therefore the Last option is correct
Step-by-step explanation:
Given:
Radius = r = 8 in
θ = 42°
To Find:
Area of Sector = ?
Solution:
We know that
Substituting the given values in the formula we get
Which is the required Answer.
Therefore the Last option is correct
Answer:
B
Step-by-step explanation:
The closed circle at - indicates that x can equal this value
The open circle at indicates that x cannot equal this value.
All values of x between - and
are valid, thus
- ≤ x <
→ B
Answer:
Step-by-step explanation:
step 1
Find the area of the garden space
First convert mixed number to an improper fraction
step 2
Find how much more land Farmer Jack needs to plant the rest of his corn