The percentage of boys 16- to 17-years-old who wear a size 11 shoe or larger is 3.59%.
<u>Step-by-step explanation:</u>
Step 1: Sketch the curve.
The probability that X>27.9 is equal to the blue area under the curve.
Step 2:
Since μ=25.2 and σ=1.5 we have:
P ( X > 27.9 ) = P ( X−μ > 27.9−25.2 )
⇒ P ( X−μ/σ > 27.9−25.2/1.5)
Since Z=x−μσ and 27.9−25.21.5=1.8 we have:
P ( X>27.9 )=P ( Z>1.8 )
Step 3: Use the standard normal table to conclude that:
P (Z>1.8)=0.0359
Percentage =
%
Therefore , The percentage of boys 16- to 17-years-old who wear a size 11 shoe or larger is 3.59%.
96
-30
——
66
Answer: the total of the skateboard was $66
Answer:
is x=1
Step-by-step explanation:
we rewrite the equation in a vertex/completed square form
![y=-2x^{2}+4x+1= -2(x-1)^{2} +3](https://tex.z-dn.net/?f=y%3D-2x%5E%7B2%7D%2B4x%2B1%3D%20-2%28x-1%29%5E%7B2%7D%20%2B3)
therefore, the line of symmetry is
![x-1=0](https://tex.z-dn.net/?f=x-1%3D0)
⇒ ![x=1](https://tex.z-dn.net/?f=x%3D1)
is the axis of symmetry