Answer:
1/2
Explanation:
Please find attached the diagram used in answering this question
A box plot is used to study the distribution and level of a set of scores
the scores are distributed into 4 groups. Each group has a value of 25%
the box plot consists of two lines and a box. the two lines are known as whiskers. the whiskers represent scores outside the middle 50%
On the box, the first line to the left represents the lower quartile. 25% of the score represents the lower quartile
the next line on the box represents the median. 50% of the score represents the median
The third line on the box represents the upper quartile. 75% of the scores represents the upper quartile
In this question, 68 is on the second line which represents the median. Thus 1/2 of the height are at least 68 inches