Final answer:
April 15 is known as Jackie Robinson Day in MLB and is celebrated annually, implying that on this date, the sale of Jackie Robinson merchandise would be expected at a baseball stadium, making the statement true.
Step-by-step explanation:
The statement regarding the sale of Jackie Robinson merchandise in a baseball stadium on April 15 is most likely true. April 15 is known as Jackie Robinson Day in Major League Baseball (MLB), which is celebrated annually to honor the legacy of Jackie Robinson, the first African American to play in MLB in the modern era. On this day, all players, coaches, and umpires wear Robinson's number, 42, and special events and festivities often take place, including the sale of merchandise related to Jackie Robinson at baseball stadiums around the United States.
Decisions about what is sold or celebrated at a game can vary as the situation varies, which could mean differences in location, special dates of significance, or annual traditions. In this case, the tradition of honoring Jackie Robinson on April 15 typically includes the sale of related merchandise at MLB stadiums, regardless of whether it is a weekday or weekend.