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The standard deviation of n numbers $$x_{1}$$, $$x_{2}$$, $$x_{3}$$,......, $$x_{n}$$, with mean x is equal to $$\sqrt{\frac{s}{n}}$$, where S is the sum of the squared differences, $$(x_{i}- x)^{2}$$ for 1 ≤ i ≤ n.

The mean and standard deviation of the 17 values in a list are 0 and 40, respectively. If one more value is included in the list, the mean of the 18 values will be 0. The standard deviation of the 18 values will be closest to which of the following?
When the positive integer $$n$$ is divided by $$7$$, the remainder is $$2$$.

Quantity A

The remainder when $$2n+1$$ is divided by $$7$$

Quantity B

$$5$$


Of the 30 college students taking a certain course, 10 are less than 21 years old and 4 received a score higher than 85 percent on the last test.

Quantity A

The number of students who are less than 21 years old and who received a score higher than 85 percent on the last test

Quantity B

3


If the product of integers a, b, c, and d is an even integer, which of the following statements about a, b, c, and d must be true?
What is the units digit of the sum $$13^{10}+17^{10}$$ ?
For how many of the possible orderings of the 5 letters of the word "merit" is the first letter m or r ot t?
A package contains between 75 and 100 marbles. When the marbles are divided into as many groups of 6 marbles as possible, the same number of marbles are left over as when the marble are divided into as many groups of 7 marbles as possible.

Quantity A

The number of marbles in the package

Quantity B

80


$$n$$ is a positive integer

$$x=n^{2}+7n+10$$

Quantity A

The remainder when $$x$$ is divided by $$2$$

Quantity B

$$1$$


n is a four-digit positive integer such that its four digits are all different and each digit is either 4, 7, 8, or 9.

Quantity A

The remainder when n is divided by 5

Quantity B

The remainder when n is divided by 9


Quantity A

The digit in the hundredths place in the the number 0.083

Quantity B

The digit in the hundreds place in number 1600


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