A number line with arrows on both sides extends from 75 to 79 in increments of 1. It shows an abacus-like representation with open circles equally spaced in vertical rows above the numbers. There are two open circles above 75, four open circles above 76, four open circles above 77, no circles above 78, and three open circles above 79. Tomas creates this dot plot. Which two numbers in the dot plot appear in his dataset the same number of times? List the lower number first and the higher number second.
___ is the lower number and ___ is the higher number that appears in his dataset the same number of times.