What is the mean year of marriage one when her age had been more than 19 and his age had been 30?
Year of Marriage Name Her Age His Age # of Children
Amasa Lyman
1517784
real text real real real
2-1517784-1
Chart: the eight wives
Chart: the eight wives
1835 Louisa Maria Tanner 17 22 8
1843 Diontha Walker 27 30 0
1844 Caroline Partridge 17 31 6
1846 Eliza Maria Partridge 23 33 5
1846 Paulina Eliza Phelps 19 33 7
1846 Priscilla Turley 17 33 6
1846 Cornelia Leavitt 21 33 2
1853 Lydia Partridge 23 40 4
SELECT AVG Year of Marriage FROM table WHERE Her Age > 19 AND His Age = 30
19 30