Answer:
Part A: 20 students
Part B: 4 hours
Step-by-step explanation:
Part A:
To find the number of students surveyed, we count the number of x there are in the graph.
students = 1 + 2 + 3 + 5 + 1 + 1 + 3 + 2 + 2 = 20
Part B:
To find the mean, we need to find the total number of hours volunteered first.
hours = 1x0 + 2x1 + 3x3 + 5x3 + 1x4 + 1x5 + 3x6 + 2x7 + 2x8 = 80
Now, we can find the mean. We divide the total number of hours volunteered by the number of students.
Mean = 80 ÷ 20 = 4
Answer:
b = -n/(2-S) -a
Step-by-step explanation:
S = n/2 (a+b)
divide both sides by (a+b)
S/(a+b) = n/2
flip the equation on the left (it is the same equation just negative)
-(a+b)/-S = n/2
divide both sides by -S
-a-b = n/(2-S)
add a to both sides
-b = n/(2-S) +a
flip the sign (multiply/divide by -1)
b = -n/(2-S) -a
Answer:
It will look like half of a parabola, rotated 90 degrees, originating at (5, -2), and reflected horizontally.
The first one since the 5 has the radical symbol
0.10 *1000 = 100
0.2 * 500 = 100
