Answer:
The 90% confidence interval for the population mean is (300.78, 315.22).
Step-by-step explanation:
We have to calculate a 90% confidence interval for the mean.
The population standard deviation is know and is σ=17.
The sample mean is M=308.
The sample size is N=15.
As σ is known, the standard error of the mean (σM) is calculated as:
The z-value for a 90% confidence interval is z=1.645.
The margin of error (MOE) can be calculated as:
Then, the lower and upper bounds of the confidence interval are:
The 90% confidence interval for the population mean is (300.78, 315.22).
Answer:
2 + 8 = 10
Step-by-step explanation:
Hope it helps you!
Answer:
The three coplannar points are
Points A, B & D in Plane O
Or
Points A, B & C in Plane P.
Step-by-step explanation:
26+3+11=40
42-40=2
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Answer: The answer is 48 cows.
Step-by-step explanation: Given that a farmer bought a number of equally priced cows at $480. After 3 died, the farmer sold the remaining cows for a total of $495 and the price per cow was $1 more when he sold them than when he bought them. We need to find the number of cows he bought originally.
Let, 'x' be the number of cows he bought originally each at a price of '$y'.
Then, we have
Subtracting the first equation from the second, we have
This gives, y = 10 or y = -16. Since price of a cow cannot be negative, so y = 10.
Thus,
Thus, the total number of cows originally bought is 48.