Given:
n = 27, sample size
df = n-1 = 26, degrees of freedom
xb = 11.8, sample mean
s = 2.3, sample standard deviation.
Because population statistics are not known, we should use the Student's t-distribution.
At 99% confidence interval, the t-value = 2.779 (from tables).
The confidence interval is
11.8 +/- 2.779*(2.3/√(27)) = 11.8 +/- 1.23 = (10.57, 13.03)
Answer: (10.6, 13.0) to the nearest tenth
I’m sorry I don’t get what your asking.
Your stating if you purchase 20 pens for 55 dollars how much money your making? Why would you be making any money when your buying items and not selling them.
The value of m which makes the equation true is; 8.2
<h3>How to solve one variable equations</h3>
The given equation is;
The value of m, for which the equation is true can be evaluated as follows;
m – 4.7 = 3.5
Add 4.7 to both sides of the equation to isolate m.
m - 4.7 + 4.7 = 3.5 + 4.7
m = 8.2
A one variable equation also known as linear equation is an equation in which one unknown variable is solved for.
Therefore, the value of m which makes the equation true is; 8.2
Read more on one variable equations;
brainly.com/question/21528555
Answer:
C
Step-by-step explanation:
y = 2x + 5
the slope (m) of this line is 2 (which can be written as 2/1)
The slope of a perpendicular line is -1/m (the reciprocal of the slope with the opposite sign)
so m = 2/1 => -1/m = - 1/2 = the slope of a line perpendicular to y = 2x + 5
