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Ready4	A certain characteristic in a large population has a distribution that is symmetric about the mean m. If 95 percent of the distribution lies within two times the standard deviation, d, away from the mean, then what percent of the distribution is greater than $m + 2 d$ ?
Ready4	A tank contains 1,000 gallons of a solution that is 6 percent salt by volume. If 200 gallons of water evaporate from the tank, the remaining solution will be approximately what percent salt?
Ready4	In a courtyard, one bell rings every $\tfrac{1}{4}$ hour and another bell rings every $\tfrac{1}{5}$ hour. Both bells ring together at exactly the beginning of each hour. Which of the following gives all of the intervals that occur between any two rings of the bells, in minutes?
Ready4	What is the largest integer k for which $81^{k} < 3^{27}$ ?
Ready4	If 60 percent of a class answered the first question on a certain test correctly, 60 percent answered the second question on the test correctly, and 60 percent answered both questions correctly, what percent answered neither question correctly?
Ready4	If two 2-digit positive integers have their respective tens digits exchanged, the difference between the pair of integers changes by 4. What is the greatest possible difference between the original pair of integers?
Ready4	A student's average (arithmetic mean) test score on 4 tests is 68. What must be the student's score on a 5th test for the student's average score on the 5 tests to be 70?
Ready4	If $y < 0$ , which of the following must decrease as $y$ decreases? I. $10y-100$ II. $\frac{y-1}{y}$ III. $y^2-y$
Ready4	According to the chart shown, which of the following is closest to the median monthly sales, in dollars, at a local coffee shop over the time period from September to June, inclusive?
Ready4	If money is invested at $r$ percent interest, compounded annually, the amount of the investment will double in approximately $\frac{70}{r}$ years. If $7,500 is invested in an account that pays 5 percent interest, compounded annually, how many years will it take for the value of the investment to be 4 times its initial value?
Ready4	In the figure shown, arc $LMN$ is a semicircle. If the length of line segment $LN$ is 11, then what is the length of semicircle $LMN$ ?
Ready4	The figure above shows $\Delta ABC$ inscribed in circle $O$ . The length of line segment $AC$ is $5$ and the measure of $\angle BCA$ is $40^\circ$ . What is the length of arc $AB$ ?
Ready4	What is the value of $2x^2-0.25x+1.2$ when $x=0.8$ ?
Ready4	What is the value of $3x^2-1.3x-0.9$ when $x=0.2$ ?
Ready4	If $P$ and $Q$ are sets of integers, $P \Delta Q$ denotes the set of integers that belong to set $P$ or set $Q$ , but not both. If $P$ consists of 15 integers, $Q$ consists of 8 integers, and 4 integers are in both $P$ and $Q$ , then $P \Delta Q$ consists of how many integers?
Ready4	If $R$ and $S$ are sets of integers, then $R \Delta S$ denotes the set of integers that belong to set $R$ or to set $S$ , but not to both. If $R$ consists of $13$ integers, $S$ consists of $17$ integers, and $9$ integers are in both $R$ and $S$ , then $R \Delta S$ consists of how many integers?
Ready4	If positive integers $x$ and $y$ are not both even, which of the following must be odd?
Ready4	If non-negative integers $n$ and $p$ are not both odd, which of the following must be odd?
Ready4	In the figure above, line segment $\overline{UT}$ has length $16$ , and rectangle $PQRU$ is a square. If the area of rectangular region $PQST$ is $225$ , what is the area of rectangular region $URST$ ?
Ready4	If $r$ is an integer and $s = (2r+1)^2$ , which of the following CANNOT be a divisor of $r$ ?