Homework Help: Math

Posted by bart on Saturday, May 15, 2010 at 8:04pm.

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

Math - adam, Sunday, May 16, 2010 at 4:45am
The answer is 2/3.

[10-6]/[12-6] = 4/6 =2/3
Math - PsyDAG, Sunday, May 16, 2010 at 11:30am
From your data, there is possibility of losing 6, 7, 8, 9, 10, 11, or 12 pounds. "Less than 10 pounds" includes 6, 7, 8 and 9 pounds lost.

I get 4/7. However,if you say ≤ 10, then it would be 5/7.
Help: three different answers - bart, Sunday, May 16, 2010 at 4:51pm
I do not know what to do. I used the Venn diagram for myself but I think I was wrong as I got 4/7 as PsyDag did. I don't think 5/7 is correct as the problem doesn't say equal to or less than 10. I do not understand Adam's equation and solution. Could you please help me understand?

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