The table below shows a relative frequency summary of sample data on distances between DNA replication origins (inter-origin distances), measured by Li et al., (2003)5 , with an in vitro Xenopus egg extract assay in Chinese Hamster Ovary (CHO) cells, as reported in Chapter 7 of Birtwistle (2008)6.
|
Inter-Origin Distance (kb) x
|
Relative Frequencyfr (x)
|
|
0
|
0.00
|
|
15
|
0.09
|
|
30
|
0.18
|
|
45
|
0.26
|
|
60
|
0.18
|
|
75
|
0.09
|
|
90
|
0.04
|
|
105
|
0.03
|
|
120
|
0.05
|
|
135
|
0.04
|
|
150
|
0.01
|
|
165
|
0.02
|
(The data set is similar to, but different from, the one in Application Problem 9.40 in Chapter 9.) Obtain a histogram of the data and determine the mean, vari- ance and your best estimate of the median.