+0  
 
0
30
2
avatar

Cards numbered 1 through 30 are placed in a bag and shuffled. One card is chosen at random. What is the probability of randomly selecting a number less than or equal to 5, or a multiple of 7?

Guest Aug 27, 2018
 #1
avatar+88775 
+2

Less than or equal to 5....there are 5 cards  ...1,2,3,4,5

 

Multiple of 7....there are 4 cards   ....  7, 14, 21 , 28

 

 

So....  [5  + 4 ] / 30   = 9 / 30  =   3 /10

 

 

 

cool cool cool 

CPhill  Aug 27, 2018
 #2
avatar+343 
+2

In order to find the probability of a certain event, we need to set up the fraction; \(\frac{p(successful)}{p(possible)}\). Let's see how many numbers are successful:

 

Less than or equal to 5: \(1, 2, 3, 4, 5\)

 

Multiple of 7: \(7, 14, 21, 28\).

 

These nine numbers are successful, so your probability would be \(\frac{9}{30} = \frac{3}{10}\).

 

- Daisy

dierdurst  Aug 27, 2018

10 Online Users

avatar

New Privacy Policy

We use cookies to personalise content and advertisements and to analyse access to our website. Furthermore, our partners for online advertising receive information about your use of our website.
For more information: our cookie policy and privacy policy.