To make concrete for the new patio, Bill mixed sand, gravel, and cement. For 12 yards of concrete, he used 6 yards of gravel and 2 yards of cement. How much gravel does he use for every part of sand?

an advantage of the standard deviation is that it increases as the dispersion of the data increases. e. the interquartile range is preferred when the data are not skewed or no have outliers. an advantage of the standard deviation is that it uses all the observations in its computation.

-362

step-by-step explanation:

(12)(4)+2(12)-34(12)+2(12)-3

  \/         \/         \/         \/

  48 +   24 -   408 + 24 - 3

      \   /               \   /

          72     -     432 - 3 = -363

the answer is 1030 it's very simple math.