#### Answer

Standardized score for Idonna's SAT math score: 1.32
Standardized score for Jonathan's ACT math score: .96
Idonna's standardized score is higher, so assuming both tests measure the same kind of ability, Idonna's score is higher.

#### Work Step by Step

We can use the standardized normal distribution to calculate a standardized score (z-score) that allows us to compare values from two different normal distributions. The z-score is calculated as $z = (x-µ) \div σ$
x is an observation, µ is the mean of the distribution, σ is the standard deviation of the distribution
z-score for Idonna = $(670-514) \div 118 = 1.32$
z-score for Jonathan = $(26-20.9) \div 5.3 = .96$