If scores on the WAIS III or WAIS IV are normally distributed, what is the probability that someone will score in what test developers consider the “borderline range” (Full Scale IQ scores ranging from 70 to 79)?

An individual received a T score of 68 on a personality test and a score of 300 on a test of academic skills that uses the academic performance standard score strategy.How many standard deviations unit does the T-score fall from the mean?