What is the average height for hewitt class, with prom less than 86, and a Peak of gragareth?
CREATE TABLE table_55025 (
    "Peak" text,
    "Height (m)" real,
    "Prom. (m)" real,
    "Class" text,
    "Parent" text
)
SELECT AVG("Height (m)") FROM table_55025 WHERE "Class" = 'hewitt' AND "Prom. (m)" < '86' AND "Peak" = 'gragareth'
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: What is the average height for hewitt class, with prom less than 86, and a Peak of gragareth? ### Input: CREATE TABLE table_55025 (
    "Peak" text,
    "Height (m)" real,
    "Prom. (m)" real,
    "Class" text,
    "Parent" text
) ### Response: SELECT AVG("Height (m)") FROM table_55025 WHERE "Class" = 'hewitt' AND "Prom. (m)" < '86' AND "Peak" = 'gragareth'