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# Probability, Statistics, Data Basic

The table above shows the number of consecutive days that 4 people have been sick over a 10 day period. If we know that Andy and Candice were not sick on the same days, which of the 10 days could there be exactly 1 sick person?

A) The first day
B) The second day
C) The third day
D) The fourth day
E) The fifth day

$21 - 2n, 21, 21 + 2n$

In the above list, what is the average of the 3 numbers?

A) $$21 - 2n$$
B) $$21$$
C) $$21 + 2n$$
D) $$63$$
E) $$2n$$

$12 - 3n, 12 - 2n, 20, 20+n$

In the above list, what is the average of the 4 numbers?

A) $$12 - n$$
B) $$12 + 2n$$
C) $$16 - n$$
D) $$16 + n$$
E) $$20$$

The sets of numbers $$X$$ and $$Y$$ satisfy the following property:

Every number that is in $$X$$ is also in $$Y$$.

Which of the following statements CANNOT be true?

A) 1 is in both $$X$$ and $$Y$$.
B) 2 is neither in $$X$$ nor in $$Y$$.
C) If 3 is in $$Y$$, then 3 is not in $$X$$.
D) 4 is in $$Y$$ but not in $$X$$.
E) 5 is in $$X$$ but not $$Y$$.

$4, 5, 7, 11, 19$

Consider the list of numbers above starting with 4. Which of the following is a relationship for finding the subsequent number?

A) Add 1 to the preceding number.
B) Subtract 3 from the preceding number.
C) Halve the preceding number and add 3.
D) Double the preceding number and subtract 3.
E) Triple the preceding number and subtract 7.

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