To solve for proportion we make use of the z statistic.
The procedure is to solve for the value of the z score and then locate for the
proportion using the standard distribution tables. The formula for z score is:
z = (X – μ) / σ
where X is the sample value, μ is the mean value and σ is
the standard deviation
when X = 70
z1 = (70 – 100) / 15 = -2
Using the standard distribution tables, proportion is P1
= 0.0228
when X = 130
z2 = (130 – 100) /15 = 2
Using the standard distribution tables, proportion is P2
= 0.9772
Therefore the proportion between X of 70 and 130 is:
P (70<X<130) = P2 – P1
P (70<X<130) = 0.9772 - 0.0228
P (70<X<130) = 0.9544
Therefore 0.9544 or 95.44% of the test takers scored
between 70 and 130.
Using it's concept, the slope of the line is of 3.
<h3>How to find the slope of a line given two points?</h3>
The slope of a line, given two points, is given by change in y divided by change in x.
In this problem, the points are (1,5) and (2,8), hence the slope is given by:
m = (8 - 5)/(2 - 1) = 3.
The slope of the line is of 3.
More can be learned about the slope of a line at brainly.com/question/3493733
#SPJ1
Answer:
2x^3 + 6x^2
Step-by-step explanation:
Volumen = area * height
You already had the area which is:
x^2 + 3x
and the heigth is 2x
Volumen = (x^2 + 3x)* 2x
Volumen = 2x^3 + 6x^2
Answer:
Option A. is correct.
Step-by-step explanation:
Given: A cell phone company recently noticed a 
sales decrease in the month of July compared to June such that 
represent June's sales.
Also, 
represents July's sales.
To find: equation that can be used to determine the sales in July
Solution:
June's sales 
Decrease in sales 
So,
July's sales 
Also,
July's sales 
Therefore,
So, option A. is correct.
