Lily is 10 years old. she gets a score of 97 on an iq test. what does this tell us about her intellectual ability?
a. lily must be a very smart girl—100 is a perfect score.
b. lily is brighter than almost two-thirds of her age-mates, as iq scores go up to about 150.
c. lily's score is in the bottom fifth of the population.
d. lily's score is about average for her age-group.