What is the experimental probability that both coins land on the same side on Isidro's next toss

1/2, or 0.5

Step-by-step explanation:

There are 4 ways that 2 coins can fall ...

Both heads (this satisfies our situation)

1st coin heads, 2nd coin tails

1st coin tails, 2nd coin heads

Both tails (this satisfies our situation)

We have 2 out of 4 ways to satisfy this situation, so our experimental probability is

P = 2/4 which reduces to

P = 1/2, or 0.5 as a decimal