21. A math teacher gives two different tests to measure student's aptitude for math. Scores on the first test are normally distributed with a mean of 23 and a standard deviation of 4.3. Scores on the second test are normally distributed with a mean of 69 and a standard deviation of 10.2. Assume the two tests use different scales to measure the same aptitude. If a student scores 28 on the first test, what would be his equivalent score on the second test