Problem 53E

An article in The Journal of Data Science [“A Statistical Analysis of Well Failures in Baltimore County” (2009, Vol. 7, pp. 111–127)] provided the following table of well failures for different geological formation groups in Baltimore County.

Let A denote the event that the geological formation has more than 1000 wells, and let B denote the event that a well failed. Determine the number of wells in each of the following events.

Solution

Step 1 of 1

We have to determine the no,of wells for the following wells

Let A be the event that the geological formation has more than 1000 wells

Let B be the event that the well failed

From the information given in the question

a) The no.of well in the event =170+443+60=673

b) The no.of wells in the event =28+363+309+933+39

=1672

c) The no.of wells in the event =1685+3733+1403+2+14+29+46+3

=6915

d) The no.of wells in the event =1685+(28-2)+3733+(363-14)+(309-29)

+1403+(933-46)+(39-3)

=8399

e) The no.of wells in the event =(28-2)+(363-14)+(309-29)+(933-46)+(39-3)

=1578