Answer:
Mean = $123
Standard deviation = 10190
Variance = 1698
Step-by-step explanation:
Mean=?
= sum of all numbers/ Total numbers
a = 93+173+107+125+56+163+144 / 7 = 861/7 = $123
Standard deviation=?
we know that = Sqareroot [ Sum (y)²] / N
we need deviation:
= x-a = y ; y²
= 93-123 = -30 ; 900
=173-123 = 50 ; 2500
=107-123 = -16 ; 256
=125-123 = 2 ; 4
=56-123 = -67 ; 4489
=163-123 = 40 ; 1600
<u> =144-123 = 21 ; 441</u>
Sum of y² = 10190.
= Square root [ 10190 / 7 ]
= 38.1
Variance = ?
= Sum ( y)² / N-1
= 10190 / ( 7-1)
= 10190 /6
= 1698
The answer is Option D. (4,2)
in this type of question , you just need to input the (x,y) , and see if the amount is correct
y - 0.75 = 1.25 (x-3)
2 - 0.75 = 1.25 ( 4 - 3)
1.25 = 1.25 (1)
1.25 = 1.25
hope this helps
G(f(1))
Plug 1 into the f function.
f(1) = 2(1) + 6
f(1) = 8
Now evaluate g(8)
g(8) = 8^2 + 6
g(8) = 70
9-8=1+5=6-2=4
That's the only one I can think of right now lol.... Hoped it helps! <3
The solutions are x=4,-10
(x-4)(x-10)=0