joyce.mangum

Standard deviation = the square root of(the sum of ( each numbers - the mean of the numbers)²)/6) =

=The square root (44/6) = 2.71

Whats your question?

Tank X = 3(Tank Y)

Tank X = W(water) + 56(liters)

Tank Y = W(water) + 16(liters)

Therefore: W + 56 = 3(W + 16)

                  W + 56 = 3W  +  48

                  -W        = -W          

                         56 = 2W  + 48

                        -48 =         -48 

                           8 = 2W

                           4 = W

Tank X = 4 + 56 = 60 liters

Tank Y = 4 + 16 = 20 liters

4 liters of water is needed to fill both tanks.

9 + 10 = 19

Actually should have been written as -(1+16/100)=-1 4/25