Using the uniform distribution, it is found that 0.833 of drinks cost less than $5.50.
An uniform distribution has two bounds, a and b.
The probability of finding a value of at lower than x is:
[tex]P(X < x) = \frac{x - a}{b - a}[/tex]
In this problem, the distribution is uniform between 3 and 6, thus [tex]a = 3, b = 6[/tex].
The proportion of drinks that cost less than $5.50 is:
[tex]P(X < 5.5) = \frac{5.5 - 3}{6 - 3} = 0.833[/tex]
0.833 of drinks cost less than $5.50.
A similar problem is given at https://brainly.com/question/24746230