In 2015, there were about 22 million teenagers (aged 13–17) in the United States. They each sent an average of 900 text messages
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Answer:
Step-by-step explanation:
Binomial probability distribution
The binomial probability is the probability of exactly x successes on n repeated trials, and X can only have two outcomes.
In which is the number of different combinations of x objects from a set of n elements, given by the following formula.
And p is the probability of X happening.
In this problem we have that:
Distribution