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“who  are  you？”這句話中，字母“o”出現(xiàn)的頻率是（　　）
A、2
B、
2
9
C、
1
5
D、
1
3
分析：先確定字母“o”出現(xiàn)的頻數(shù)和數(shù)據(jù)總和，再根據(jù)頻率、頻數(shù)的關(guān)系：頻率=頻數(shù)÷數(shù)據(jù)總和，可得數(shù)據(jù)“o”出現(xiàn)的頻率．
解答：解：∵“who  are  you？”這句話中，共9個字母，字母“o”出現(xiàn)的頻數(shù)為2，
∴字母“o”出現(xiàn)的頻率=
2
9
．
故選B．
點評：本題考查頻率、頻數(shù)、總數(shù)的關(guān)系：頻率=頻數(shù)÷數(shù)據(jù)總和．
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