X-4
——
X
-2-4
——
-2
Calcule the difference
-6
—-
-2
Reduce the fraction with -2
=3
(i) The mean is
The variance is
Compute the second moment :
Then the variance is
(ii) For a random variable , where are constants, we have
and
Then for , we have
He uses 15 gallons. Because 270/6 = 45. Meaning he drives 45 miles per gallon. So 675/45=15. 15 gallons he will need to use to drive 675 miles.
Answer:
6x
Step-by-step explanation:
7x - x
6x