Answer:
and this Z-score is “unusual.”
Step-by-step explanation:
To calculate the Z score use the following formula

Where
μ is the average
is the standard deviation
x is the data to which we will calculate the z-score
In this case

So


A z-score is unusual if
or 
Finally
and this Z-score is “unusual.”
Hello,
x²+5x-6=0
Δ=5²+4*6=49=7²
x=(-5+7)/2 or x=(-5-7)2
==>x=1 or x=-6
Answer B
Number 44) is 18 hours a month. You get this by 4.5 x 4
Answer:
15
Step-by-step explanation: