Identify the resulting probability as theoretical or experimental.

One-half of the people in a chess club are adults 21 years old or older. The other half are younger. What is the probability that a club member chosen at random will be under 21 years old

Question

Identify the resulting probability as theoretical or experimental. 

 

One-half of the people in a chess club are adults 21 years old or older. The other half are younger. What is the probability that a club member chosen at random will be under 21 years old

hartnn · Answer

probability = number of favorable events/ total number of events. 
if half of the ppl are younger than 21 yeras of age then, those are your number favorable events.

anonymous · Answer

whats ?

hartnn · Answer

what is your doubt exactly ?

anonymous · Answer

im just confused on everything

hartnn · Answer

see, when half of the class are below 21 years of age,
say there are 100 people in class
then 50 are below 21 years of age, right ? 
now probability = number of favorable events/ total number of events. 
we want probability of member being younger than 21 years
so, number of favorable events = 50 
 total number of events = 100
any doubts here ? read carefully...

anonymous · Answer

ok yh now i understand sorry

hartnn · Answer

i am glad that you understood :)
so your final probability will be 50/100 = 1/2 or 0.5 :)

anonymous · Answer

correction it would be a theoreticail probabilty 50/100 cuz its not expermental

hartnn · Answer

ok, both/all probability here will be 1/2 or 0.5

anonymous · Answer

ok