Question

Tickets numbered 11 to 30 are mixed up and then a ticket is drawn at random. What is the probability that the ticket drawn has a number which is a multiple of 2 or 7?

Answer 1

Answer:

1/10

Step-by-step explanation:

Answer 2

Answer:

probability of a number between 11 to 30 that is a multiple of 2 or 7 is  $\frac{11}{20}$

= 0.55

Step-by-step explanation:

the ticket numbers are 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30

from 11 to 30, there are 20 numbers

there are 10 multiples of 2 from 11 - 30.

they are 12, 14, 16, 18, 20, 22, 24, 26, 28, 30

there are 3 multiples of 7 from 11 to 30

they are 14, 21, 28

excluding the repeated numbers, there are 11 numbers that is a multiple of 2 or 7

∴ n = 11

therefore, probability of a number between 11 to 30 that is a multiple of 2 or 7 is  $\frac{11}{20}$

=$\frac{11}{20}$

= 0.55