已知甲、两组数据如茎叶图所示，若两组数据的中位数相同，平均数也相同，那么m+n=____

根据短文内容判断正误。

    U2 is the name of a band from Ireland. It's one of the most famous rock bands in the world.

    In l978, a l7-year-old high school student, Larry Mullen, looked for some musicians to make a band. Finally, he found another three boys and they set up a band. The four boys named their band U2.

    They travelled a lot and gave concerts in many countries. More and more people got to know them and love their music. Many of their songs, such as Beautiful Day and Walk On, were popular. In the l980s, the band became famous.

    Now the four members of U2 are still good friends and their music is still popular. People in the world still enjoy their music.