一個盒子內有 4 張 $10 紙幣、6 張 $20 紙幣和 2 張 $100 紙幣。從該盒子內隨機取出一張紙幣,求該紙幣的面額小於 $50 的概率。

中五級網上練習_續概率

Quiz
•
Mathematics
•
11th Grade
•
Medium
khoot math
Used 1+ times
FREE Resource
10 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
2.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
從所有兩位數中隨機選取一個數,求該數的個位數字或十位數字是 7 的概率。
3.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
袋子 A 中有 3 個紅球和 5 個白球,袋子 B 中有 4 個紅球和 2 個白球。從每個袋子中隨機抽出一個球。求抽出兩個相同顏色的球的概率。
4.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
在某慈善組織中,選出靜怡和庭樂擔任行政總裁的概率分別是 0.3 和 0.65。若在該組織中只有一位行政總裁,求選出擔任行政總裁的人既不是靜怡亦不是庭樂的概率。
0.05
0.245
0.805
0.95
Answer explanation
解:
答案是A。
P(選出的人既不是靜怡亦不是庭樂)
= 1 - P(選出靜怡或庭樂)
= 1 - [P(選出靜怡) + P(選出庭樂)]
= 1 - (0.3 + 0.65)
= 0.05
5.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
某層架上有 3 隻藍杯、2 隻白杯和 7 隻綠杯。現從該層架中先後隨機抽出 2 隻杯,而每次抽出的杯都會放回。求抽出的第一隻杯是藍杯和抽出的第二隻杯是白杯的概率。
6.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
浩熹和安庭會在學校內吃午餐的概率分別是 0.7 和 0.4。求他們都不在學校內吃午餐的概率。
0.28
0.42
0.72
Answer explanation
答案是A。
P(二人都不在學校內吃午餐)
= (1 - 0.7) x (1 - 0.4)
= 0.18
7.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
袋子裏有 5 個紅球和 7 個白球。若從中隨機抽出 3 個球,求抽出 2 個紅球和 1 個白球的概率。
Answer explanation
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