The radius of a circle is always half its diameter.
Therefore the radius of a circle with a diameter of 121 inches is 1/2(121).
Hence, the correct answer is r = 1/2 (121)
Center : Mean Before the introduction of the new course, center = average(121,134,106,93,149,130,119,128) = 122.5 After the introduction of the new course, center = average(121,134,106,93,149,130,119,128,45) = 113.9 The center has moved to the left (if plotted in a graph) because of the low intake for the new course. Spread before introduction of the new course : Arrange the numbers in ascending order: (93, 106,119, 121), (128, 130,134, 149) Q1=median(93,106,119,121) = 112.5 Q3=median(128,130,134,149) = 132 Spread = Interquartile range = Q3-Q1 = 19.5 After addition of the new course,
(45,93, 106,119,) 121, (128, 130,134, 149)
Q1=median(45,93,106,119)=99.5
Q3=median (128, 130,134, 149)= 132
Spread = Interquartile range = 132-99.5 =32.5
We see that the spread has increased after the addition of the new course.
Ok this is how it work:
1+4=5
2+5=12=2+1+4+5=12
3+6=21=12+3+6=21
8+11=? do the same to that take 21+8+11=40
ask me if you don't get it. I explain it further.