Mariah’s RIAA total is actually wrong especially if you tally her individual albums from the RIAA website. She’s tied with Barbra Streisand at 68.5M

Breakdown in millions:
three gold albums (1.5)
three platinum albums (3.0)
multiplatinum albums (9 + 6 + 6 + 5 + 5 + 4 + 4 + 3 + 2 = 44.0
two diamond album (20.0)

Total: 1.5 + 3.0 + 44.0 + 20.0 = 68.5

Why did RIAA shave off 2.0 M? Unless certification of EP albums count as 0.5M of LP?