Mini Exam 20 — Timed Mini Exams

Questions in this quiz (10)

1. A student had scores of 80, 90, 85, 100, 75, and 85 on his tests in a history class. If the teacher removed his worst test grade, which value describing the set of scores would change?

   • Mean
   • Median
   • Mode
   • None of the above

2. In 1875, Matthew Webb successfully completed a roughly 22-mile swim across the English Channel in about 22 hours. Given that there are approximately 1.61 kilometers in a mile, what was his approximate average swimming speed in kilometers per hour?

   • $$0.62\text{ km/hour}$$
   • $$1.61\text{ km/hour}$$
   • $$35\text{ km/hour}$$
   • $$44\text{ km/hour}$$

3. The U.S. stock market has returned a historical average of approximately 10% per year. If this rate of return were to continue, which function would model the value, $$V$$, of an initial investment of $$V_0$$ in the stock market $$t$$ years from now?

   • $$V(t)=V_0(10)^t$$
   • $$V(t)=V_0(110)^t$$
   • $$V(t)=V_0(1.1)^t$$
   • $$V(t)=V_0(0.1)^t$$

4. A college surveyed all its students about their preference for a new school mascot. The number of students who preferred Bear exceeded the number who preferred Dog by 240 students. How many students selected Eagle?

   • 600

5. According to a recent student survey, 40% of high school seniors in the United States have taken a college credit class while in high school. If there are 3.7 million students in this year's high school graduating class, approximately how many of these students likely took a college credit class?

   • $$148{,}000$$
   • $$222{,}000$$
   • $$1{,}480{,}000$$
   • $$2{,}220{,}000$$

6. A scatterplot has a decreasing line of best fit that is approximately at $$(10,49)$$ and $$(20,24)$$. If the trend continues, what would most likely be the predicted $$y$$-value when $$x=25$$?

   • $$5$$
   • $$10$$
   • $$15$$
   • $$20$$

7. Circle $$A$$ has a radius of 2 units and an area of $$x$$ square units. Circle $$B$$ has a radius twice that of circle $$A$$, and its area is expressed as $$nx$$, where $$n$$ is a constant. What is the value of $$n$$?

   • $$1$$
   • $$2$$
   • $$3$$
   • $$4$$

8. A square with a perimeter of 16 inches is inscribed in a circle, with all four vertices of the square on the circle. What is the diameter of the circle?

   • $$4$$
   • $$4\sqrt2$$
   • $$4\sqrt3$$
   • $$8$$

9. The height, $$h$$, in meters of an object $$t$$ seconds after being dropped is modeled by $$h(t)=-4.9t^2+h_0,$$ where $$h_0$$ is the initial height. If the height of the object 3 seconds after being dropped is 0, what is the initial height of the object?

   • $$9.8\text{ meters}$$
   • $$17.2\text{ meters}$$
   • $$24.4\text{ meters}$$
   • $$44.1\text{ meters}$$

10. The table shows values of $$x$$ and $$f(x)$$. Which function correctly expresses the value of $$f(x)$$?

    • $$f(x)=x+1$$
    • $$f(x)=x^2$$
    • $$f(x)=x^3$$
    • $$f(x)=x^2+1$$