3. Here is the data from the 20 students again: {0,
0,1,1,2,2,2,3,3,3,3,3,3, 4, 4, 4, 4, 5, 5, 6).
Find the mean and standard deviation for
number of siblings.
What percent of the data is within one
standard deviation from the mean? Enter your
answer as a percent XX%.

the answer is b

step-by-step explanation:

answer by yourhope:

hi! : )

a farmer that lived in ancient egypt would most likely be barried in the sand, in the desert!

: )

second option

step-by-step explanation:

the measures of a triangle equal 180. use that to find x.

2x+3x+4x=180

9x=180

9x/9=180/9

x=20

now you know x, you know angle a is 40°, angle b is 60°, angle c is 80°.

because angle a is 40°, the first option doesn't work.

because angle b is 60°, the second option does work.

when you add angle a and b, you get 100°. complementary means it equals 90°, so the third option doesn't work.

when you add angle a and c, you get 120°, which is not 100.