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1. The probability that they are the 4 oldest people in the group = 4/9

   What is probability?

   The area of mathematics known as probability deals with numerical descriptions of how likely it is for an event to happen or for a claim to be true. A number between 0 and 1 is the probability of an event, where, broadly speaking, 0 denotes the event’s impossibility and 1 denotes its certainty.

   According to the given information:

   the group of people = 9

   you randomly select 4 of them

   the probability that they are the 4 oldest people in the group?

   According to the formula :

   Probability = expected number of outcome/Total number of outcome

   If there are group of 9 people, then the total outcome of events will be 9.

   If we are to select 4 oldest people from the group, then the expected outcome is 4.

   So,

   The probability that they are the 4 oldest people in the group = 4/9

   To know more about probability visit:

   https://brainly.com/question/17156622

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