Answer:
12
Step-by-step explanation:
·
×
=
=12
7417.5 is the total amount of people in that country
Answer:
Adriana took care of 20 kids. And Brandy took care of 12 kids.
Step-by-step explanation:
Here,
Let us suppose Adriana took care of "x" number of children after school.
Then, by the question,
Brandy took care of 0.6 times as many children as adriana.
i.e. Brandy took care of =0.6*x children
So,
Total no. of children that they took care of is = 
=
The data given says they took care of 32 children,
so,
or,
∴
So, Adriana took care of 20 kids. And Brandy took care of (=0.6*20)=12 kids.
Answer:
a) CI = ( 5,1 ; 5,7 )
b) SE = 0,1
Step-by-step explanation:
a) Sample random n = 100
Mean = μ = 5,4
Standard deviation s = 1,3
CI = 99 % α = 1 % α = 0,01 α/2 = 0,005
z(c) for 0,005 is from z-table z(c) = 2,575
z(c) = ( X - μ ) /s/√n CI = μ ± z(c) * s/√n
CI = 5,4 ± 2,575* 1,3/10
CI = 5,4 ± 0,334
CI = ( 5,1 ; 5,7 )
b) SE = Standard deviation / √n
SE = 1,3 /10 SE = 0,1
We can support that with 99 % of probability our random variable will be in the CI.
Visualize one train going north and the other going south. To determine their distance apart, we could add the distance one train travels north to the distance that the other train travels south.
Thus, |62 kph * t| + |68 kph * t] = 455 km (Seems that you may be mixing km with miles; can't do that; choose one or the other.)
Then
455 km
------------------------ = t = 3.5 hours
(62 kph + 68 kph)
