Help in math probability

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I have a total of three different answers that I got and had help with and nothing definitive. One way that I figured it out I received 4/7. I asked two other people and they gave me two completely different answers.

Assume that the weight loss for the first two months of a diet program has a uniform distrbiution
over the interval 6 to 12 pounds. Find the probability that a person on this diet loses less than 10
pounds in the first two months.

Not sure what to do.

A) 1/6
B) 5/7
C) 1/3
D) 2/3

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