Question

A Person's chance of Winning a raffle is 1/18, if he buy's 15 tickets :

a.) Determine the total number of tickets sold (4 marks).

b.) What number of tickets does he need to buy ,If he is to increase his chance of winning to 5/18. (4 marks).

Answer 1

A) 18 times 15 =270 
So there would be 270 tickets sold. 

15 times 5= 75
He would need to buy 75 tickets

Answer 2

What is probability ?

• The proportion of all conceivable outcomes to the number of outcomes in an exhaustive set of equally likely outcomes that result in a certain event.
• For example -Since there is a 50% chance that the outcome will be heads, we can anticipate 50 heads.

Given ,

          chance of Winning a raffle is 1/18, if he buy's 15 tickets

(a) if we raffle 18 time,  15 tickets

           then total number of tickets sold  = 18 × 15  =270

So,

                  there would be 270 tickets sold.

(b) if chance of winning is increase

then ,we raffle tickets ,

                           15 times 5= 15 × 5 = 75

      He would need to buy 75 tickets.

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