W - a width
3w - a length
27 ft² - an area
Therefore:
w · 3w = 27
3w² = 27 |:3
w² = 9 → w = √9 → w = 3
3w = 3 · 3 = 9
width = 3
length = 9
The perimeter:
P = 2 · width + 2 · length
P = 2 · 3 + 2 · 9 = 6 + 18 = 24 ft.
Answer:
1/4 , .25 , twenty five percent.
Step-by-step explanation:
Answer:
There is a 99% probability that at least one of the intervals will cover the true mean yields at their location
Step-by-step explanation:
In a 90% confidence interval of the mean of a population, there is a 90% probability that it cover the true mean of the population.
What is the probability that at least one of the intervals will cover the true mean yields at their location?
This is 1 subtracted by the probability that none of them cover the true mean yields at their location.
For each one, there is a 10% probability that it does not cover the mean. So the probability that both do not cover the mean is ![0.1*0.1 = 0.01](https://tex.z-dn.net/?f=0.1%2A0.1%20%3D%200.01)
The probability that at least one of the intervals will cover the true mean yields at their location is 1-0.01 = 0.99 = 99%.
Answer:
25
Step-by-step explanation:
To solve, set it up as a proportion. 20/100 = 5/x
Cross multiply to get 20x = 500
Divide 500 by 20 to get 25!
At the rate of 84 words per 2 minutes, which translates to 42 words per one minute.
So in one minute she types 42*1=42 words
In 3 minutes she types 42*3=126 words
In 9 minutes she types 42*9=378 words