Answer: 191
Step-by-step explanation:
Formula to find the minimum sample size required to estimate a population proportion or percentage:
, where 
= proportion estimated by prior study.
E= Margin of error.
z* = Critical z-value.
Given : Confidence level = 95%
Critical value for 95% confidence = z*=1.96
E= 7%= 0.07
Then, 
Hence, the minimum sample size required=191
Answer:
3x+(4x-1)+90°=180°{sum of angles in a triangle}
3x+4x-1+90°=180°
7x+89°=180°
7x=180°-89°
7x=91°
divide both sides by 7
x=13
<u>Answer-</u>
<em>Noah spent </em><em>19 hours 12 minutes</em><em> working on the transmission.</em>
<u>Solution-</u>
Noah spent 24 hours working on his car.
He spent 
on his time working on his transmission and rest on other .
So the total time spent by Noah working on the transmission is,
Therefore, Noah spent 19 hours 12 minutes working on the transmission.
Answer:
$87.60
Step-by-step explanation:
Assuming that mary is on a fixed income rate, we can calculate that Mary is making approximately $5.84 per week.
17.50 / 3 = 5.833333.... -> <em>5.84</em>
Now we multiply this number by 15 to get the amount of money she saves over this time.
5.84 * 15 = <em>87.6</em>
<em>So, we can see that Mary has saved $87.60 in 15 weeks.</em>
