“Welcome to Senior High School．”（歡迎進入高中），在這段句子的所有英文字母中，字母O出現(xiàn)的頻率是    ．
【答案】分析：數(shù)出這個句子中所有字母的個數(shù)和字母“o”出現(xiàn)的頻數(shù)，由頻率=頻數(shù)÷總個數(shù)計算．
解答：解：在“Welcomc to Senior High School．”這個句子中：有25個字母，其中有5個“o”，故字母“o”出現(xiàn)的頻率為 5÷25=0.2．
故答案為：0.2．
點評：本題考查頻率、頻數(shù)的關(guān)系：頻率=．
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Welcome to Chatsworth
Opening Time
House 11:00 a.m. Last admission (允許進入) 4:30, closes 5:30 p.m. Last entry to Scots Rooms, when open, is 4:00 p.m.
Garden 11:00 a.m. Last admission 5:00, closes 6:00 p.m.
June, July and August Garden opens at 10:30 a.m.
Admission
Adults ………………………………………………………………………£ 6.50
Senior citizens & students ………………………………………………… £ 5.25
Children …………………………………………………………………… £ 3.00
Childrenunderthree …………………………………………………………Free
Family Ticket …………………………………………………………… …£ 16.75
Car Park …………………………………………………………………… £ 1.00
Shopping
Two gift shops, with many times based on designs from the House and Garden.
Christmas shopping available at weekends from November to Christmas
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Restaurant serving home made food. Bar serving drinks and cakes.
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