You are looking for a new cell phone plan. The first company, Cellular-Tastic (f), charges a monthly fee of $35 and $0.11 per mi
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Answer:
0.8746 = 87.46% probability of at least 6 failures in 7 trials.
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.
7 trials
This means that
The probability of success in any trial is 9%?
So the probability of a failure is 100 - 9 = 91%, which means that
Probability of at least 6 failures in 7 trials?
This is:
In which
0.8746 = 87.46% probability of at least 6 failures in 7 trials.