50 points urgent
1. draw a histogram from all the data. starting at the bottom row, for each set of 10 flips, place an “x” in the column corresponding to the number of heads that set produced. your histogram should look similar to the example below:
*i don't need graph, just answer questions below *

Step-by-step explanation:

mean=5.5

standard dev=2.85

Within 1 standard dev = 5.5-2.85 to 5.5+2.85 = 2.65 to 8.35

Within 2 standard dev = 5.5-2(2.85) to 5.5+2(2.85) = -0.2 to 11.2

Within 3 standard dev = 5.5-3(2.85) to 5.5+3(2.85) = -3.05 to 14.05

answer:     true

step-by-step explanation:

x = -3

y = -18

step-by-step explanation:

to solve by substitution, substitute one variable and solve for the other. then substitute again to find the remaining variable.

x-1/3(3x-9) = -3 since y=3x-9 substittute y.

x-1/3(3x-9)=-3

x + x +3 = -3

2x+3=-3

2x+3-3= -3-3

2x=-6

x=-3

substitute again into y=3x-9

y=3(-3)-9

y=-9-9

y=-18