7/28/2020 Practice Final Exam
4. Approximate the mean of the frequency distribution for the The approximate mean age is
ages of the residents of a town.
(Round to one decimal place as needed.)
years.
Frequency
31
39
13
27
Age
0-9
10-19
20-29
30-39
40-49
50-59
60-69
70-79
80-89
24
51
30
11
9
5.
Why is the standard deviation used more frequently than the variance?

If x = 12 and y = 3, what is the value of x - y 2? 81 6 3 18

An airplane consumes fuel at a constant rate while flying through clear skies, and it consumes fuel at a rate of 64 gallons per minute while flying through rain clouds. let c represent the number of minutes the plane can fly through clear skies and r represent the number of minutes the plane can fly through rain clouds without consuming all of its fuel. 56c+64r < 900056c+64r< 9000 according to the inequality, at what rate does the airplane consume fuel while flying through clear skies, and how much fuel does it have before takeoff? the airplane consumes fuel at a rate of gallons per minute while flying through clear skies, and it has gallons of fuel before takeoff. does the airplane have enough fuel to fly for 60 minutes through clear skies and 90 minutes through rain clouds?

Use the quadratic formula to solve the equation. if necessary, round to the nearest hundredth. x^2 - 20 = x a. 5, 4 b. -5, -4 c. -5, 4 d. 5, -4