Which of these is an example of a non-random sample?
A.
At a school assembly, five students are randomly chosen to receive free admission to a theme park.

B.
Airline passengers to Orlando, Florida, are asked about vacation plans.

C.
Out of all the seventh grade students in a public school district, fifteen are chosen to win a trip to a vacation destination.

The answer is C

Step-by-step explanation:

find the magnitude of the trig term  

csc

(

x

)

−

1

by taking the absolute value of the coefficient.

1

find the lower bound of the range.

tap for more

y

=

−

2

find the upper bound of the range.

tap for more

y

=

0

the range is  

y

≤

−

2

or  

y

≥

0

.

(

−

∞

,

−

2

]

∪

[

0

,

∞

)

{

y

|

y

≤

−

2

,

y

≥

0

}

step-by-step explanation:

quit

step-by-step explanation: