Answer:
Step-by-step explanation:
The confidence interval gives an estimate of range of values that could possibly contain the unknown population parameter which could be the population mean or population standard deviation.
Given that the lower end of the confidence interval is 20 minutes and the upper end of the confidence interval is 58 minutes, if the population mean time customers spent on that website is 31 minutes a day, then the correct option is
C. Yes, because the population mean, mu, is included within the confidence interval estimate.
Answer:
first group x's with x's and y's with y's
then complete the squra with x's and y's
2x^2-8x+2y^2+10y+2=0
2(x^2-4x)+2(y^2+5y)+2=0
take 1/2 of linear coeficient and square
-4/2=-2, (-2)^2=4
5/2=2.5, 2.5^2=6.25
add that and negative inside
2(x^2-4x+4-4)+2(y^2+5y+6.25-6.25)+2=0
factor perfect squares
2((x-2)^2-4)+2((y+2.5)^2-6.25)+2=0
distribute
2(x-2)^2-8+2(y+2.5)^2-12.5+2=0
2(x-2)^2+2(y+2.5)^2-18.5=0
add 18.5 both sides
2(x-2)^2+2(y+2.5)^2=18.5
divide both sides by 2
(x-2)^2+(y+2.5)^2=9.25
that is a circle center (2,-2.5) with radius √9.25
Answer:
Angle y is also 40 degrees. Angle x and y are vertical angles, thus they have the same angle measure.
Step-by-step explanation:
Answer:
245.2
Step-by-step explanation:
(64.3 - 3)8 / 2
(61.3)(8) / 2
490.4 / 2
= 245.2
Answer:
B. 38%
Explanation:
Given parameters:
Number of hits = 5hit
Total hits = 13
Unknown:
Percentage of hits shed made = ?
Solution;
The percentage of hit made = x 100
input the parameters and solve;
Percentage of hit made =
Percentage of hit = 38%
Percentage of hit = 38%