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Alex787 [66]
4 years ago
11

Plz help me with this math problem

Mathematics
2 answers:
tatuchka [14]4 years ago
7 0
Seventh graders, sixth graders, then eighth graders
liubo4ka [24]4 years ago
6 0
Least: seventh-graders (61%)
sixth-graders (63%)
Most: eighth-graders  (66%)
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Assume that the number of sales per day of an app in the apple ios app store is normally distribbuted.
Papessa [141]
You need to know the distribution's mean and standard deviation.

\mathbb P(X>100)=0.20\implies\mathbb P(X\le100)=0.80

Transforming to the standard normal distribution, and letting \sigma denote the standard deviation,

\mathbb P(X\le100)=\mathbb P\left(\dfrac{X-86}\sigma\le\dfrac{100-86}\sigma\right)=0.80

The z-score corresponding to this probability is approximately z=0.8416, so you have

\dfrac{100-86}\sigma=0.8416\implies\sigma=16.64
6 0
3 years ago
Write the equation in slope intercept<br> through: (1,5), perp. to y=-1/10x + 3
Gwar [14]
First to get the equation you knew to understand one thing about perpendicular lines. The slope of the line is the opposite reciprocal of the perpendicular lines or the new slope is m = 10.

Then you use the formula
y = mx + b
you plug in your values from the point and the new slope.
(1,5) with new slope m
5= 10(1)+b
5-10=b
-5 = b
then make your new equation
y = 10x -5
that's your line that goes through point (1,5) and is perpendicular to the line given
4 0
4 years ago
Find the x-intercepts of the following parabola.
pashok25 [27]

Answer:

B (-1,0), (3,0)

Step-by-step explanation:

Quadratic Formula

8 0
3 years ago
Help me please last one I need help with:)
Ivenika [448]
Since the length of this rectangle is 13 units and the width is 5 units, the area can be found this way:
A=l*w
A=13*5
A=65 so the third choice

Hope this helps!
8 0
4 years ago
Read 2 more answers
5,ooo invested 5 years 3% interest compounded continuously
galben [10]
A=pe^rt

A future value
P principle 5000
R interest rate 3/100 =0.03
T time 5 years

A=5,000×e^(0.03×5)
A=5,809.17
6 0
3 years ago
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