7th grade math

Question

There are ten marbles of different colors. You have drawn a marble recorded it's color and replaced it fifty times with these results 9 purple, 16 orange, 6 yellow and 19 green. Make a prediction of how many marbles of each color there are.

Answer 1

First, let me tell you that IT'S should not have been written, because that only means IT IS.  What should be in its place is ITS, without the apostrophe--that's the possessive form of "it."

 

Secondly, the problem does NOT state that there are exactly four different colors, altogether; there could have been blue or black or white marbles in there--a perfectly worded problem would have clarified whether this is possible.

 

The percentages that you have observed (assuming just these four possible colors) are

PURPLE: 18%   ORANGE 32%   YELLOW 12%   GREEN 38% and by taking these percentages of ten, we ESTIMATE

that there 2 purple, 3 orange, one yellow and 4 green marbles.  

 

Purple, for example is 0.18(10) = 1.8 which we round up to 2.