Answer:
Standard Deviation = 9.1
(Please vote me Brainliest if this helped!)
Step-by-step explanation:
Standard deviation = square root of variance
= 
= 9.1
To find x- intercepts
y = 0
(x+4)(x-2)=0
x+4=0 or x-2 = 0
x = -4 or x = 2
And the vertex will be (-1,-9)
The correct option is (B)
In this situation, the -$55 represents the debt of $55,
since this happens when Miguel does not have enough money in his account to
cover payments or transactions. On Thursday, he has a debt of more than $55. The
explanation behind this is if an account balance is less than -55 dollars, it exemplifies
a debt bigger than 55 dollars.
<span>Critical points are where the derivative is 0, i.e. where it crosses the x - axis
The Critical points lies where the derivative is 0, while it crosses the x-axis, SO, in this case the choice 3 looks like best answer for this.
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