Two groups separately performed an experiment by tossing a coin in the air. Group C performed 50 trials and group D performed 100 trials. Each group recorded the results in the table below:

Group Heads Tails
C 31 19
D 51 49

Question

Two groups separately performed an experiment by tossing a coin in the air. Group C performed 50 trials and group D performed 100 trials. Each group recorded the results in the table below:


Group	Heads	Tails
C	31	19
D	51	49

anonymous · Answer

What conclusion can be drawn about the number of trials and the probability of the coin landing on heads or tails?
 The experimental probability and the theoretical probability for group C is same.
 The experimental probability and the theoretical probability for group D is same.
 The experimental probability is closer to the theoretical probability for group C than group D.
 The experimental probability is closer to the theoretical probability for group D than group C.

anonymous · Answer

@phi

phi · Answer

experimental probability is what they got (in the table)
theoretical probability is "theory"
if you have two sides, and are equally likely to get one as the other
and you  toss the coin 100 times,  what is the theoretical number of heads you will get?
any idea?

anonymous · Answer

no im lost

phi · Answer

if a coin is fair, and you toss it 100 times, do you expect to get
100 heads and no tails?

anonymous · Answer

no

phi · Answer

the coin has one head side and one tail side, and "in theory"  you should see the same number of heads and tails.

phi · Answer

if you toss the coin 100 times, theory says you should see an equal number of heads and tails.  in other words, 1/2 of the 100 will be heads and 1/2 of 100 will be tails

anonymous · Answer

oh ok

anonymous · Answer

so would my answer be one of the first two? cause thats what im thinking.

phi · Answer

toss the coin 100 times, what is the theoretical number of heads you will get?

anonymous · Answer

50 right?

phi · Answer

yes.  and how many tails?

anonymous · Answer

50 also?

phi · Answer

yes  so 50     50    is the theoretical number of heads and tails for group D

if you toss the coin 50 times, how many heads do you expect (in theory) ?

anonymous · Answer

25

phi · Answer

yes,  and 25 tails

so here is what we have
group C
theory      25      25
expt         31      19

groud D
theory      50       50
expt         51        49

phi · Answer

can you make sense of any of the answer choices?

anonymous · Answer

oh i think its D. then the last answer choice @phi

anonymous · Answer

am i right?

phi · Answer

yes. choice D sounds good

anonymous · Answer

thank you!!! ^_^