Please Help I Dont Understand This At All ! Medal && Fan

What is the experimental probability that the next person you survey does NOT have a gaming system ??

You take a survey of 250 people ages 13 - 18 and ask whether they have a home gaming system, a portable gaming system, or no gaming system.

Age
13 14 15 16 17 18

Home Gaming 12 22 26 32 24 16
Portable Gaming 5 5 4 9 7 6
No Gaming 18 12 8 6 12 16

Question

Please Help I Dont Understand This At All ! Medal && Fan 



What is the experimental probability that the next person you survey does NOT have a gaming system ??

You take a survey of 250 people ages 13 - 18 and ask whether they have a home gaming system, a portable gaming system, or no gaming system. 

                                            Age 
                                 13 14 15 16 17 18 

Home Gaming           12 22 26 32 24 16 
Portable Gaming         5  5   4   9   7   6 
No Gaming                18 12  8  6   12  16

espex · Answer

Looks like your probability is 1 in 3 since you have three options and the person can only be categorized into one of them.

rajee_sam · Answer

Does all the people add up to 250 or there are some who do not have a gaming system at all?

rajee_sam · Answer

there 240/250 have some type of gaming system

so 10 people do not have any gaming system

So what will be the probability then?

rajee_sam · Answer

The question is P(Not having Gaming System)

rajee_sam · Answer

the total no. adds up to only 240 what happens to the rest 10 whether they have any gaming system or not??

campbell_st · Answer

The number of people without a gaming system is 72

so based on the survey the probability that a person does not have a gaming system is 

P( No Gaming System) = 72/250


but you may like to check that the number of responses adds to 250.

rajee_sam · Answer

The no. adds upto only 240