X= -3-y
y= 2(-3-y) +2
y= -6 -2y +2
3y = -4
y= -4/3
x= -5/3
Answer:
The standard error is 11.
Step-by-step explanation:
Given : If the standard deviation of a normally distributed population is 22.0 and we take a sample of size 4.
To find : The standard error ?
Solution :
The standard error formula is

Where,
is the standard deviation of a normally distributed population
n=4 is the sample size
Substitute the value,



Therefore, the standard error is 11.
Let, the number of books on Monday = m
On Tuesday = 2m
On Wednesday = 2m - 6
Equation: m + 2m + (2m - 6) = 19
You can solve it:
5m = 19 + 6
m = 25/5
m = 5
In short, He sold 5 books on Monday
Hope this helps!
In proportional, it is y/x=k or y=kx
basically it is like y=mx+b, it is a line