Two-year-old Aidan says, "We saw two deers." Aidan is demonstrating

The cutoff score for intellectual disability is approximately two standard deviations below the mean. If IQ scores were normally distributed, this would mean that approximately _____ percent of the population would fall below this cutoff?

a. 0.5 b. 2 c. 9 d. 15

For children and adolescents, heritability estimates indicate that about half of the variance in their IQ scores is explainable by genetic differences

Indicate whether this statement is true or false.