Answer:
We need a sample size of at least 1161.
Step-by-step explanation:
In a sample with a number n of people surveyed with a probability of a success of 
, and a confidence level of 
, we have the following confidence interval of proportions.
In which
z is the zscore that has a pvalue of 
.
The margin of error for the interval is:
For this problem, we have that:
90% confidence level
So 
, z is the value of Z that has a pvalue of 
, so 
.
How large a sample should she take?
We need a sample size of at least n.
n is found when 
So
Rounding up
We need a sample size of at least 1161.
The Answer Is B
Explanation : If you divide 1497 by 60 you get 24.95 24 divide by 8 is 3
Answer:
D. 63 degrees
Step-by-step explanation:
For the first answer
Cos B = 0.45
tan60 = √3
= 60° = arctan √3
Cos B = 0.45
B = 63°
Thus B = arc cos 0.45 = 63°
See the attached figure to better understand the problem
in the triangle ABD
tan 29=BD/(525+x)------> BD=(525+x)*tan 29------> equation 1
in the triangle CBD
tan 38=BD/x-------> BD=x*tan 38-----------> equation 2
equals 1 and 2
(525+x)*tan 29=x*tan 38----> 525*tan29+x*tan29=x*tan38
x*[tan38-tan29]=525*tan29---> x=525*tan29/[tan38-tan29]---> x=1282.12 ft
BD=x*tan 38-----> 1282.12*tan38-----> BD=1001.71 ft-----> 1002 ft
the answer is1002 ft
Answer:
n cubed x n cubed
Step-by-step explanation:
by simplified us step by step in a equivalent equation.
