Answer:
We are confident that the true mean for the average income of all U.S. households is between (58820;71180)
Step-by-step explanation:
Information provided
represent the sample mean for the average income of all US households
population mean
s=15000 represent the sample standard deviation
n=25 represent the sample size
Confidene interval
The confidence interval for the true mean of interest is given by the following formula:
(1)
The degrees of freedom are given by:
The Confidence level is is 0.95 or 95%, then the significance is and , the critical value for this case would be
Replacing in formula (1) we got:
We are confident that the true mean for the average income of all U.S. households is between (58820;71180)
9514 1404 393
Answer:
Pia drove faster
Step-by-step explanation:
Speed is the ratio of distance to time. If the time is the same, the greater distance is associated with the greater speed.
Pia drove farther in 3 hours, so drove faster.
The circumference of a circle is 2
r
C= 8.5 x 2 x
C= 17 x
C= 53.407 centimetersHope this helps :)
Answer:
ΔB
Step-by-step explanation:
ΔA's angles are: 58º, 54º, and 68º
68º is found by 180 - (58 + 54)
ΔB's angles are: 54º, 68º, and 58º
58º is found by 180 - (68 + 54)
ΔA and ΔB have the same angles, therefore they are similar triangles
Answer:
When there are 108 presents, there are 60 candy canes
Step-by-step explanation:
candy canes : presents = 5:9
5/9 = x/108
cross multiply:
(5) (108) = 9x
540 = 9x, divide both sides by 9
x = 60