Let
be the number of days spent at Tahoe and San Francisco, respectively.
We don't know the values of
and
yet, but we know that the holiday lasted 9 days:
![T+S=9](https://tex.z-dn.net/?f=T%2BS%3D9)
We also know that each day spent in Tahoe costed 350 and each day spent in San Francisco costed 475. So, the total cost of the holiday is the sum of the number of days muliplied by their cost:
![350T+475S=3650](https://tex.z-dn.net/?f=350T%2B475S%3D3650)
If we put the two equations together, we have the system
![\begin{cases}T+S=9\\350T+475S=3650\end{cases}](https://tex.z-dn.net/?f=%5Cbegin%7Bcases%7DT%2BS%3D9%5C%5C350T%2B475S%3D3650%5Cend%7Bcases%7D)
Which yields
![S=4,\quad T=5](https://tex.z-dn.net/?f=S%3D4%2C%5Cquad%20T%3D5)
Answer: simple random sampling
Step-by-step explanation:
In statistics, when a subset of individuals known as sample chosen from a population by a random selection of individuals such that the chances of selecting each individual is same, then the sampling method is called simple random sampling method.
Given: To assess the learning outcomes of a Statistic course, 5 students are chosen at random from each of the 30 Statistics classes.
here chances for selectin students is same.
The sampling method used here : " simple random sampling "
Answer:
16mm
Step-by-step explanation:
Just do 40 * 2/5 = 80/5 = 16mm