Can somebody help with geometry?
1 answer:
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The expected number of a distribution is its mean.
- The expected number of Americans who are satisfied with the way things are going in the United States is 6
- The standard deviation of Americans who are satisfied with the way things are going in the United States is 2.05
The given parameters are:
<em /><em> --- the proportion that are satisfied</em>
<em /><em> --- the sample size</em>
<em />
<u>(a) The expected number that are satisfied</u>
This is calculated using:
So, we have:
The expected number of Americans who are satisfied with the way things are going in the United States is 6
<u>(b) The standard deviation of those that are satisfied</u>
This is calculated using:
So, we have:
The standard deviation of Americans who are satisfied with the way things are going in the United States is 2.05
Read more about expected value and standard deviations at:
Answer:
A. 2x + 150y = 1,500
2x + 120y = 1,320
The flights were $300 each, and they stayed 6 nights.
B. $1,380
Step-by-step explanation:
Let x be the cost of the flight (in one side) and y be the number of nights on their vacation.
A. Brenda had a fancy room for $150 per night, then she paid $150y for y nights. Brenda's total is $1,500, then
Brenda's friend had a smaller room for $120 per night, then she paid $120y for y nights. Brenda's friend total is $1,320, then
Subtract two equations:
Substitute into the first equation:
Hence
2x + 150y = 1,500
2x + 120y = 1,320
The flights were $300 each, and they stayed 6 nights.
B. If a third friend joined them and stayed in a mid-range room for $130 per night, then he paid
The total cost is