Last month more than half of their patients lost at least 7

Last month more than half of their patients lost at least 7 lbs.

Last month at least one of their patients lost more than 10 lbs.

Last month at least one of their patients lost exactly 7 lbs.

Last month all of their patients lost at least 7 lbs.

None of the above statements is true.

A weight-loss clinic advertised that last month its patients, on average, lost 7 lbs. Assuming thataverage refers to the mean, which of the following claims must be true based on this information?

Solution

Using the process of elimination:

#1 . is false as we are talking about the average of last month only.

#2.Remember, a mean / average means you need more than one of something. Some high number and some low numbers. SO it is true.

#3 ,#4 we should not assume the values.

#5.If all of their patients lost atleast 7 lbs then the average should be more than 7lbs.

Last month more than half of their patients lost at least 7 lbs. Last month at least one of their patients lost more than 10 lbs. Last month at least one of the

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