F.3 12.1 Introduction to Probability

F.3 12.1 Introduction to Probability

Watch the Video and Answer the Questions

Multiple Choice

A letter is chosen randomly from the word ‘HELLO’. Find the
       probability of choosing "L".

•  $\frac{1}{5}$  

•  $\frac{2}{5}$  

•  $\frac{3}{5}$  

•  $\frac{4}{5}$  

Multiple Choice

A letter is chosen randomly from the word ‘DIFFERENCE’. Find the

probability of choosing "E".

• $\frac{3}{10}$

• $\frac{1}{3}$

• $\frac{2}{5}$

• $\frac{1}{10}$

Multiple Choice

Six cards are marked with the numbers 2, 3, 4, 4, 7 and 8 respectively.

If a card is selected at random, find the probability that the number on

the card selected is an even number.

• $\frac{1}{4}$

• $\frac{1}{3}$

• $\frac{1}{6}$

• $\frac{2}{3}$

Multiple Choice

At midnight, there are only six customers in a restaurant. Their ages are 20, 23, 27, 39, 42 and 51. If a customer is chosen at random, find the probability  that
the age of the customer is an even number.

•  $\frac{1}{6}$  

•  $\frac{1}{3}$  

•  $\frac{2}{3}$  

•  $\frac{1}{2}$  

Multiple Choice

At midnight, there are only six customers in a restaurant. Their ages are 20, 23, 27, 39, 42 and 51. If a customer is chosen at random, find the probability that

the sum of the two digits of the age of the customer (兩位數字的總和) is greater than 5.

• $\frac{1}{6}$

• $\frac{1}{3}$

• $\frac{2}{3}$

• $\frac{5}{6}$

• $\frac{1}{2}$

Multiple Choice

There are 24 eggs inside a basket and 2 of them are rotten. If one

egg is taken out at random, find the probability that it is NOT rotten.

• $\frac{1}{2}$

• $\frac{1}{24}$

• $\frac{1}{12}$

• $\frac{11}{12}$

Multiple Choice

A number is randomly selected from the 30 integers 1 to 30. What is

the probability that the number selected is a multiple of 5?

• $\frac{1}{5}$

• $\frac{1}{6}$

• $\frac{7}{30}$

• $\frac{4}{29}$

Multiple Choice

There are 15 balls in a bag, and n of them are red balls. If a ball is drawn at random  from the bag, the probability of drawing a red ball is  $\frac{1}{3}$   . Find the value of n. 

• 45

• 12

• 10

• 5

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