Final answer:
The lower quartile, also known as the first quartile (Q1), is the second value in the provided 5-number summary.
For the given series (11, 23, 26, 30, 37), the lower quartile is 23.
Step-by-step explanation:
The question asks for the lower quartile of the given 5-number summary, which is: 11, 23, 26, 30, 37.
The lower quartile, also known as the first quartile (Q1), is the median of the lower half of the scores.
To clarify, the given values are part of a 5-number summary, meaning they are already in sorted order and represent the minimum value, first quartile, median, third quartile, and maximum value, respectively.
Therefore, according to this summary, the lower quartile (Q1) is the second value in the list, which is 23.