Mark will have to work a total of 40 hours that week. 340 = 8.50h. 340/8.50 = h. h = 40
The probability you're asked to find is
where
is the event that either event occurs (A, B, or both), and
is the event that both events occur.
Recall that
which means
You're told that
,
, and (if I'm reading the diagram correctly)
.
So,
Another way of seeing this is that the event A consists of the regions "A not B" and "A and B". So the probability that "A not B" occurs is
Similarly, B consists of "B not A" and "A and B", so you have
So the probability that A or B, but not both, occur is
First convert the total km's to miles:
4.8 km / 1.609 km per mile = 2.983 miles.
Now convert miles to feet:
2.983 miles x 5280 feet per mile = 15,751.39 feet Rounds to 15,751.40 feet