Probability-Coin Toss

[Guest]

Please help me. I am looking at 12 grp. tossing coins. Each group appears to toss 1 head and 2 heads most often. Can I post the chart?
# of times tossed
0 heads 1 head 2 head 3 head
5 14 17 4
7 16 14 3
7 14 14 5
4 16 6 4
5 14 16 5
8 11 15 6
6 21 25 8
6 19 9 6
6 18 14 2
1 15 19 5
5 13 15 7
6 11 15 8

We are asked to combine all the groups' data together by adding up the values in the columns.

I need to find out, is the empirical model similar to the theoretical model or are there significant differences?

Were the coins used "fair" coins?

Is it possible that the coins had 2 tails.

Explain my answers. I cannot even figure out where to start on this one and it is due this evening!!

Help

 

[Gene]

Sorry, I'm much too late but...
The results seem to say they are flipping three coins and the theoretical model says they should be in a ratio of
1 3 3 1 so the first group flipped five times. That works for most groups but the fourth and seventh groups don't add up (across) to a multiple of 8. Typos or I'm wrong. Except for that the results seem reasonable for fair coins.