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3) Since there are 12 months in a year, there are four groups of 3 months in a year.
So, if 420 dollars are saved every three months, a total of
dollars will be saved per year.
4) Using the given figure, the difference between the two numbers is composed by two little squares. If this difference is 72, then one little square is 36.
The sum of the two numbers is composed by 8 little squares, for a total of
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Using the uniform distribution, it is found that there is a 0.3 = 30% probability that Samantha has to wait less than 4.5 minutes to catch the bus.
<h3>What is the uniform probability distribution?</h3>It is a distribution with two bounds, a and b, in which each outcome is equally as likely.
The probability of finding a value of at lower than x is:
In this problem, the time is uniformly distributed between 0 and 15 minutes, hence the bounds are a = 0 and b = 15.
The probability that Samantha has to wait less than 4.5 minutes to catch the bus is given by:
More can be learned about the uniform distribution at brainly.com/question/13889040