Answer:
The answer is "
"
Step-by-step explanation:
For the +4 sample proportion
Sample percentage measurements estimated stdev
![= \sqrt{\frac{[(0.45)(1-0.45)]}{[(16+4)]}}\\\\ = \sqrt{\frac{[(0.45)(0.55)]}{[(20)]}}\\\\ = \sqrt{\frac{0.2475}{20}}\\\\= \sqrt{0.012375}\\\\=0.111](https://tex.z-dn.net/?f=%3D%20%5Csqrt%7B%5Cfrac%7B%5B%280.45%29%281-0.45%29%5D%7D%7B%5B%2816%2B4%29%5D%7D%7D%5C%5C%5C%5C%20%3D%20%5Csqrt%7B%5Cfrac%7B%5B%280.45%29%280.55%29%5D%7D%7B%5B%2820%29%5D%7D%7D%5C%5C%5C%5C%20%3D%20%5Csqrt%7B%5Cfrac%7B0.2475%7D%7B20%7D%7D%5C%5C%5C%5C%3D%20%5Csqrt%7B0.012375%7D%5C%5C%5C%5C%3D0.111)
Calculating the critical z for a=0.1, two-tailed = 1.64
Calculating the confidence interval:

Answer:
No
Step-by-step explanation:
Perpendicular lines have negative reciprocal slopes, for example:
2/3 and -3/2
It is not possible for 2 lines to have negative slopes and be perpendicuar. This is because a slope must be negated to get the perpendicular slope.
Area by Heron's formula:
semiperimeter = (15 + 20 + 25)/2 = 60/2 = 30 cm

The formula of the area of a triangle: Area = 1/2 * base * height
1/2 * 25 * height = 150
12.5 * height = 150
height = 150/12.5
height = 12 cm
Answer:
6 hours
Step-by-step explanation:
Let the labor hours be x.
The bill comprises of parts cost plus labor cost. Labor cost is hours times the cost per hour. Then we have equation:
- 265 + 48x = 553
- 48x = 553 - 265
- 48x = 288
- x = 288/48
- x= 6
So the answer is 6 hours.
I hope this helps you
89.?=830
?=830/89
?=9.325