From the table given in the question, we are aseked to find the experimental probability that only 1 of 4 children in a family is a boy.
So using the table given where:
heads represent a boy
tails represent a girl.
total outcome = 20
Number of outcome with only a boy = 4 (that is the ones with only 1 head)
recall probability = Number of poosible outcomes
Number of total outcomes
Probability = 4/20
Probability = 1/5
So, the experimental probability is:
= 1/5 * 100
= 20%
Therefore, the experimental probability = 20%.