Answer:
1481
Step-by-step explanation:
20 markers are needed to cover the 10 kilometers.
The '68-95-99.7' rule says
-About 68% of values fall within one standard deviation of the mean.
-About 95% of the values fall within two standard deviations from the mean.
-Almost all of the values — about 99.7% — fall within three standard deviations from the mean.
Here 
Therefore, the probability

The required probability

3x2700=Just Mr. Delgado's shares' value= $8100
Since they own an equal number of shares, their total value of stock before the sale is two times what each of them has separately.
$8100 x 2=value of their stock= $16200