91影视

A histogram is provided based on times of runners who participated in several different Japanese marathons.

The features of the provided histogram are as follows,

1)The distribution is positively skewed.

2)The outliersarefrom 650 to 750.

3)The typical or representative difference value is 350.

4)The histogram is unimodal with the mode of 100 seconds approximately.

The size of the sample is,

\(90 + 190 + 180 + 160 + 120 + 80 + 60 + 40 + 30 + 20 = 970\)

The proportion of the runners ran the late distance more quickly than the early distance is computed as,

\(\begin{array}{c}\frac{{negative\;time\;difference}}{{Total\;sample\;size}} &=& \frac{{10}}{{970}}\\ &=& 0.001\end{array}\)

Therefore, theproportion of the runners ran the late distance more quickly than the early distance is 0.001.