Plz help I don’t understand this question:)

The physical fitness of an athlete is often measured by how much oxygen the athlete takes in (which is recorded in milliliters per kilogram, ml/kg). the mean maximum oxygen uptake for elite athletes has been found to be 60 with a standard deviation of 7.2. assume that the distribution is approximately normal.

Ling is using fraction strips to add 2/3 and 7/12's the sum is one whole plus how many twelves?

Shirley spelled 12 of her 15 spelling words correctly on the test. what percentage did shirley get on the test?