Answer: The size of sample is 50
Step-by-step explanation:
Since we have given that
Variance of a sample was reported = 144
Variance of population was reported = 7200
Let the sample size be 'n'.
As we know the formula for "Variance of a sample":
![V(X)=\frac{\sigma^2}{n}\\\\144=\frac{7200}{n}\\\\n=\frac{7200}{144}\\\\n=50](https://tex.z-dn.net/?f=V%28X%29%3D%5Cfrac%7B%5Csigma%5E2%7D%7Bn%7D%5C%5C%5C%5C144%3D%5Cfrac%7B7200%7D%7Bn%7D%5C%5C%5C%5Cn%3D%5Cfrac%7B7200%7D%7B144%7D%5C%5C%5C%5Cn%3D50)
Hence, the size of sample is 50.
x+y=17000 (x.7+y.15)/100=2000 (7x+7y)+8y=200000. 8y=200000-17000.7 y=61.5.5.5 17000-y=9375=x x=9375
Answer:
Red grapefruit costs more per pound.
Step-by-step explanation:
Red grapefruit
y =2x
This is in the form y= mx+b where m is the slope and b is the y intercept
The cost per pound is the slope, which is 2
The cost per pound is $2
Pink grapefruit
We need to find the slope
We have 2 points (0,0) and (4,4)
m = (y2-y1)/(x2-x1)
= (4-0)/(4-0)
=4/4
= 1
The slope is 1
The cost per pound is $1
Answer:
5 meters
Step-by-step explanation:
The perimeter of a rectangle can be expressed as 2l+2w.
2l+2w=50
l=w+15
Substitute:
2(w+15)+2w=50
2w+30+2w=50
4w+30=50
4w=20
w=5
Hope this helps!
-12x - 24 = -18x + 24
+24. +24
-12x = -18x + 48
+18x. +18x
6x = 48
/6. /6
X = 8