Answer: 0.4207
Step-by-step explanation:
Let 
be the sample mean area.
Given: Population mean : 
sq. feet
Standard deviation: 
sq. feet
Sample size : n= 10
The probability that the sample mean area is 
or less if the manufacturer’s claim is true.
Required probability = 0.4207
Answer: 11.38
Step-by-step explanation:
I just did this math nation question and that’s what they said the answer was
An equilateral triangle has all side lengths the same, and all angles are 60 degrees. Using this we can split the triangle along its altitude to get two right triangles with a hypotenuse of length 10 and a base of 1/2 of the original length, so 5. Now we can either use the Pythagorean theorem (a^2+b^2=c^2) or the fact that it is a 30 60 90 triangle (angles measure at 30 60 and 90 degrees) Pythagorean theorem is probably easier.
It stated that the squares of the two legs of a right triangle add to the square of the hypotenuse. So a(the altitude)^2+5(the base)^2=10(the hypotenuse)^2
A^2+5^2=10^2
A^2+25=100
A^2=75
A=sqrt(75)
A=5*sqrt(3)
Final answer:
The altitude of an equilateral triangle with side length 10 is 5sqrt(3), or about 8.66
