Question

The graph shows the quantity of each piece in a toy building kit. If one piece is missing, what is the probability that it is a blue piece with four holes?

Answer 1

A. about 11%
B. about 23%
C. about 33%
D. about 67%

Answer 2

"one peace is missing" (for our problem) is equivalent to saying "one peace is selected"

Answer 3

How many pieces are there altogether?
How many of them are "blue" with "4 holes"?

Answer 4

55 pieces
12 are blue with 4 holes

Answer 5

12 are blue, but not all are with 4 holes

Answer 6

How many of these blue peaces have 4 holes (not 2 holes, but 4 holes)

Answer 7

?

Answer 8

and I think the total amount of piece is also incorrect.

Answer 9

9+8+12+6=35

Answer 10

(not 55)

Answer 11

yes it's wrong I didn't understand

Answer 12

So, you have 4 "desired" peaces (blue, with 4 holes) out of 35 peaces (altogether).

Answer 13

11%

Answer 14

And the chance to select a blue peace
(or to have the blue peace missing - which is same in the context of the problem), is....

yes, about 11%

Answer 15

But Solomon, you are only including those with 4 holes. What about the 20 pieces with only 2 holes that are also in the kit?

Answer 16

Thank you very much! Can you help me with some few more?

Answer 17

35 - all peaces
4 - blue with 4 holes (the probability of which to be selected we want to find)

Answer 18

LegendarySadist, I doubt that I made an error....

Answer 19

No, there are 55 pieces. There are 35 pieces that have 4 holes and 20 with 2 holes.

Answer 20

two columns in each column, every column?

Answer 21

For the blue pieces, 12 have 4 holes and 8 have two holes. It is shown in the graph that there are different amounts of pieces with 2 or 4 holes for every color.

Answer 22

No, it is 12 overall... that is how they drew the Histogram with frequencies, or else they would need two histograms.

Answer 23

Then the green line being at 8 represents what?

Answer 24

I would say Solomon is right on this one