Quick
justin's gas tank is 1/6 full. after he buys 7 gallons of gas, it is 1/2 full. how many gallons can justin's tank hold?

Rewrite the fractions so they have a common denominator:

1/2 = 3/6

The tank was at 1/6 so:

3/6 - 1/6 = 2/6 simplifies to 1/3 of gas was added by the 7 gallons

There are three 1/3's to a whole ( full tank).

7 x 3 = 21

The gas tank can hold 21 gallons.

answer: .64

step-by-step explanation

set up the formula for standard deviation for this set of numbers, then simplify