Answer: 0.7881446
Step-by-step explanation:
Given : Mean :
Standard deviation :
Sample size :
The formula to calculate the z-score :-
For x= 267 dollars
For x= 269 dollars.
The P-value :
Hence, the probability that they have a mean cost between 267 dollars and 269 dollars.= 0.7881446
Answer:
12.5% bought a hard copy. 42.5% printed it from the web. And 45% read it online.
Step-by-step explanation: Since there are 200 students in total, think of 200 as 100% of students. You would divide 25/200 which equals 0.125 then multiply 0.125 times 100 which is 12.5 or 12.5%. Same process with the other numbers (85/200)x100=42.5 (90/200)x100=45. Hope this is what the question was asking
Answer:
x= (1/7 hj) + (27/7)
Step-by-step explanation:
Calculator online
Answer:
y = 2x - 3
Step-by-step explanation:
Start by writing out the given equation.
-2x + y = -3
The goal is to isolate the variable y.
For this equation, all you need to do is add 2x to each side.
-2x + y + 2x = -3 + 2x
Therefore, the answer is y = 2x -3.
I don't know if you are are familiar with the equation y = mx + b, but here's a little refresher. m is the slope, or in this case 2. b is the y-intercept, or in this case -3.
The equation y = mx + b is slope intercept form, so if you know this, you should be able to write any equation in slope intercept form.
Hope this helps!
Answer:
True
Step-by-step explanation:
15/7 is about 2.14 which is less than 3