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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(diǎn)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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