Here is a sample data set that appears to be nearly normal (as suggested by the histogram). 69.8 86.4 66 80.7 66.5 62.4 79.4
72 74.4 62.5 64.6 68.4 66 81.8
73.5 80.7 71.6 55.5 65.6 76.5 63.5
74.7 69.6 76.2 | 67.1 73 65.3 61
88.4 80.771.4 84 75.1 53.668
73.3 72.9 62.7 76.9 61.4 66.3 72.9
54.3 64.9 72.9 65.6 74 71.8 64.3
67.1 | 66.7 62.4 72 70.6 63.5 81.2
60.6 | 74.7 57.6 82.476.5 74.9 59.7
75.1 68.6 71.6 57.6 71.2 71.2 70.2
20
15
Frequency
10
50 55 60 65 70 75 80 85 90
length (cm)

step-by-step explanation:

given that ab is divided into equal parts as

ac, cd, de, ef, fg, gh, hi, ib.

from this we find that f is the midpoint of ab.

so using mid point formula we find

f = (3,7)

similarly considering fb, we get

h = mid point of fb = ((6,6) and g, mid point of fh is

g = (9/2, 13/2)

i is mid point of hb

so i =(15/2,11/2)

arc length = 6.63311 ft.

step-by-step explanation:

the formula the arc measure is:

arc length s=2πr(c)/360

where:

c   is the central angle of the arc in degrees

r   is the radius of the arc

π   is pi, approximately 3.142

using the above formula we get

s =

thus we find that arc length of an arc for a circle of radius 20 feet and central angle 19 degrees is

6.63311 feet