Have the students divide up into groups of two and flip a coin 16 times and record the outcome.
Each time have the students flip four times. (so there will be 64 actual tosses)
Have the students make a chart that will help them to see the distribution of the experiment.
Let the random variable x be the number of heads
x=0 T T T T
x=1 TTHT, TTTH, THTT, HTTT
x=2 TTHH. THHT. HHTT. THTH. HTHT. HTTH
x=3 THHH, HTHH, HHTH, HHHT
x=4 HHHH
The chart should look something like this.